Answer:
Paleontologists thinks that the younger fossils are a species that underwent an-agenesis, gradually evolving a new morphology or/and the younger fossils are a new species that branched off the older one, rapidly evolving a new morphology.
Explanation:
Fossils are the safeguarded remains or hints of creatures, plants, and different life forms from an earlier time. Fossils range in age from 10,000 to 3.48 billion years of age. The perception that specific fossils were related with certain stone layers drove nineteenth century geologists to perceive a land timescale. Like surviving life forms, fossils differ in size from minuscule, similar to single-celled microscopic organisms, to monstrous, similar to dinosaurs and trees.
Fossils give strong proof that living beings from the past are not equivalent to those discovered today; fossils show a movement of advancement. Fossils, alongside the similar life systems of present-day life forms, comprise the morphological, or anatomical, record.
By contrasting the life structures of both present day and terminated species, paleontologists can deduce the ancestries of those species. This methodology is best for life forms that had hard body parts, for example, shells, bones or teeth. The subsequent fossil record recounts the account of the past and shows the development of structure more than a great many years.
atoms have a _____ surrounded by __
a negative electron, positive nuclei
b positive electron, negative nuclei
C. Positive nucleus, negative electrons
d. negative nucleus, positive electrons
Explanation:
c.) Postive nucleus, Negative electrons
Answer:
option a
Explanation:
negative electron,positive nuclei
where stem cells transform to T cells
Answer:
Scientists from the UCLA AIDS Institute and the Institute for Stem Cell Biology and Medicine have derived T-cells from human embryonic stem cells, raising hopes for a gene therapy to combat AIDS. The Proceedings of the National Academy of Sciences reported the findings in its July 14, 2006, online edition.
“We may be able to use human embryonic stem cells to treat T-cell and other blood diseases,” says lead author Zoran Galic, assistant research biologist. “This could be a very important weapon in the fight against AIDS.”
The researchers cultured human embryonic stem cells and incubated them on mouse bone-marrow cells, which in turn converted them into blood-forming cells. Those cells were injected into a human thymus that had been implanted in a mouse. The thymus transformed the bloodforming cells into the T-cells that HIV targets for destruction.
“Our results indicate that it’s possible to decipher the signals that control embryonic stem cells’ development into mature T-cells,” says Jerome Zack, associate director of the UCLA AIDS Institute and professor of microbiology, immunology and molecular genetics. “This way we can eventually repopulate the immune system of patients needing T-cells.”
One of the body’s main defenses against disease, Tcells are manufactured in the thymus. The organ shrinks as we age, weakening the immune system. The scientists anticipate that their findings could give rise to gene-therapy approaches for other diseases related to T-cells such as severe combined immunodeficiency, or “bubble-boy disease.”
Explanation:
Explanation:
T cell progenitors originate in the bone marrow and, through a series of defined and coordinated developmental stages, enter the thymus, differentiate, undergo selection, and eventually mature into functional T cells.
A population of mice in a field contains 5000 individuals at the beginning of a study. During the course of 1 year 2500 new individuals are born and 1000 individuals die, such that the population size after 1 year is 6500. Assuming that annual per capita birth rate (b) and per capita death rate (d) do not change, what will the population size be after another year has passed
Answer:
The population size would be of 8,450 mice.
Explanation:
While the initial population of mice was 5,000 and there were 2,500 new births, the birth rate is 50% (2,500 / 5,000 = 0.5). Now, the 1,000 deaths, in turn, represent a mortality rate of 20% (1,000 / 5,000 = 0.2). In this way, at the end of the year, the number of mice became 6,500 (5,000 - 1,000 + 2,500).
Maintaining the same population growth rates, the number of new births would be 3,250 (6,500 x 0.5), and the number of deaths would be 1,300 (6,500 x 0.2), with which at the end of the second year the number of mice would be 8,450 (6,500 - 1,300 + 3,250).
One of the first electronic applications used for navigation was:
LORAN-C
Sonar
Radar
Radio Direction Finder
Answer: LORAN-RC
Explanation: I had the same question.
Answer:
Sonar
Explanation:
Collection of abiotic and biotic factors together in an environment__________
A-Ecosystem
B-organism
C-Ecology
D-species
E-abiotic
F-Biotic
G-community
H-population
which of the following is not an example of responding to stimuli?
a.Maintaining internal ph levels
b. pulling your hand away from something hot?
c.stopping at a red light?
d plants growing towards light?
Answer:
i think the answer is B. As it does not happen as a response to certain action
Explanation:
hope it helps
Cellular Respiration happens in the
(Select all that apply)
Mitochondria
Cytoplasm
Chloroplast
Cell Membrane
Answer:
Mitochondria
Explanation:Cellular respiration occurs in the double-membrane organelle called the mitochondrion.
The sensor or detector tells the integrating center what needs to be done
True
False
Answer:
True
Explanation:
It is true because a sensor or detector is an organ that detects external stimuli from the environment or changes in both internal and external environment, it then send the information to the integrating center.
The integrating center receive stimulus or information from sensor and activate responses to the stimulus.
What type of energy does a ball have when it rolls down a hill?
Answer: When a ball rolls downhill, the gravitational potential energy of the ball is transformed into motion energy.
Answer:
When a ball rolls downhill, the gravitational potential energy of the ball is transformed into motion energy.
Hope this helps :)
The change in physical traits of different species to survive in their environment is an example of an __________________?
Answer:Evolution consists of changes in the heritable traits of a population of organisms as successive generations replace one another.
Explanation:
what is cell division ?
Answer:
Cell division is the process by which a parent cell divides into two or more daughter cells .
Explanation:
I hope it helps ❤❤
Answer:
Cell division is the means of reproduction; in multicellular organisms, it is the means of tissue growth and maintenance.
Explanation:
Otherwise known as mitosis or meiosis.
What prevents acetylcholine from accumulating in the neuromuscular junction and causing a sustained contraction in a normal individual
Answer:
Botulinum toxin
Explanation:
Botulinum toxin is known to hinder the release of acetylcholine into the synaptic cleft at the neuromuscular junction.
This leads to acetylcholine not attaching to its receptors and eventually leading to the inability to have muscle contractions.
Hence, in this case, the correct answer is Botulinum toxin prevents acetylcholine from accumulating in the neuromuscular junction in individuals.
Like DNA, RNA contains four nitrogenous bases.
Three of them are the same as those found in
DNA. The one that is different is called
The five-carbon sugar in RNA is called
DONE
Answer:
1. Uracil
2. Ribose
Explanation:
DNA and RNA are both types of nucleic acids. Although they are made up of similar constituent molecules, they are slightly different. All nucleic acids have three major constituents viz: nitrogenous base, pentose sugar and phosphate group.
The four nitrogenous bases found in DNA are Adenine, Guanine, Cytosine and Thymine. However, three of this bases are found in the RNA molecule but one different one called URACIL, which replaces Thymine is found. Also, the pentose (five-carbon) sugar found in DNA is deoxyribose while that of RNA is RIBOSE.
.which of the following can a chemical bond do?
a all of these
B store energy
c change element properties
d realease energy
_______ from forest fires and volcanoes, as well as the decay of dead plants and animals, causes a type of pollution from carbon oxides.
Answer:
Carbon dioxide (CO2)
Explanation:
Carbon dioxide is one of the most common atmospheric gases. It is naturally produced into the atmosphere in the following ways:
- via cellular respiration in organisms
- forest fires
- volcanic eruption
- decomposition of dead matter (plants and animals)
The release of CO2 gas into the atmosphere by one or all of the above listed ways poses a great threat to the environment as it causes a type of pollution. CO2 causes pollution by being a greenhouse gas i.e gases capable of trapping heat. This results or contributes to global warming in the atmosphere.
Cells of an organism perform the following chemical reaction: 6 CO2 + 6 H2O + → C6H12O6 + 6 O2 To which organism do these cells most likely belong? A. a rubber tree plant B. an earthworm C. a whale D. a rabbit
Answer:
A. a rubber tree plant.
Explanation:
Hello!
In this case, since plants perform a process called "photosynthesis", by which the carbon dioxide and water are taken into the vegetable cell and get transformed into sugar (glucose) and oxygen; the organism the perform the given reaction is A. a rubber tree plant as such reaction shows the aforementioned process. It is important to mention that the rest of them perform cellular respiration, which is the contrary one:
C6H12O6 + 6 O2 → 6 CO2 + 6 H2O
In order to get energy.
Best regards!
A classmate tells you that comic books are full of superheroes with powers caused
by mutations. Therefore, all mutations must be beneficial. Decide whether or not you agree. Write a
paragraph to argue your position regarding the benefits or harm caused by mutations.
Answer:
No because that is just one example, and a completely fictional example at that, used for entertainment.
Explanation:
Mutations could cause health problems and abnormalities that could prove fatal. Though there could be benefits, like immunities to diseases, inherited or contracted, just the opposite could happen as well. And even if some benefits could be gained, a whole new set of problems could result from that change that weren't there before.
Movement across the cell membrane that does not require energy is called
Answer:
It's called passive transport
Explanation:
It's called passive transport because it doesn't use energy like active transport does.
Answer:
Passive transport
Explanation:
This is a movement of a substances across the membrane without the expenditure of cellular energy. In contrast, active transport is the movement of substances across the membrane using energy from adenosine triphosphate.
When given an unknown bacterial sample the first step is to expand the current bacterial population. Which type of media best suites this need and Why
A. MSA agar
B. LB media
C. MacConkey agar
D. Columbia CNA agar
Answer:
The correct answer among the given options is - LB media
Explanation:
The type of bacteria is unknown so can not be determined precisely what media should be best for such population however, on the given information the best media would be LB media for this population due to the fact that all other media forms that are selective will inhibit its growth and it is a nutrient-rich medium which favors the growth of bacteria.
Hence, the bacteria population should be placed in LB media for growth and after expanding its growth one should place in its selective media plate.
Which eukaryotic cell organelle contains genetic information and controls most cell
activities?
O cell membrane
O vacuole
O nucleus
chloroplast
Answer:
nucleus
Explanation:
because it contains its genetics and its like its brain
Which of the following is an example of a mechanical wave?
ultraviolet light waves
radio wave
vibrating guitar string
Blue light waves
Answer:
ultra violet light waves
If other beavers move to this area to build a dam, what is one need for which they are most likely competing?
Answer:
space adequate for building a shelter
Explanation:
edge 2021
Strawberry plants can reproduce sexually by
producing fruit or asexually by sending out runners.
Runners are extensions of the central stem of the
plant that spread out along the ground and grow
into new strawberry plants.
3. What is the advantage of sending out many
runners from the central stem? What is the
disadvantage to the central plant?
Answer:
ooh fruit sex lol
Explanation:
A nation has a population growth rate of 3.2%. The country currently has a population of 12 million. In how many years will the
population be 48 million, assuming a constant growth rate?
A)
44 years
B)
70 years
C)
88 years
D)
100 years
Answer: A) 44 years
Explanation:
An organism that converts sunlight to make its own food is called a(n) Choose all that apply.
producer.
producer.
chemotroph.
chemotroph.
autotroph.
autotroph.
heterotroph.
heterotroph.
Answer:what he said^
Describe the energy transformation that takes place as the roller coaster moves up the hill and explain how each form of energy changes.
Answer:
A roller coaster ride is a thrilling experience which involves a wealth of physics. Part of the physics of a roller coaster is the physics of work and energy. The ride often begins as a chain and motor (or other mechanical device) exerts a force on the train of cars to lift the train to the top of a very tall hill. Once the cars are lifted to the top of the hill, gravity takes over and the remainder of the ride is an experience in energy transformation.
Which of the following is likely abiotic limiting factor of fish in a pond ecosystem? Pollution Disease-causing bacteria Food supply Predators
Answer:
pollution
Explanation:
Answer:
Pollution
Explanation:
Becauc=se it is the only abiotic answer and it would kill the fish limiting the fish.
When comparing proteins and polysaccharides, the following similarities
can be identified: *
Both consist of linked monomers via the process of dehydration reactions.
O Both consist of linked monomers via the process of hydrolysis.
O Both consist of linked sugars via the process of dehydration synthesis.
O O
Both consist of linked amino acids via the process of hydrolysis.
Answer:
The comparison of proteins and polysaccharides establishes that they have similarity in both consist of linked monomers via the process dehydration reactions.
Explanation:
Both proteins and polysaccharides are polymers whose structure consists of the union of monomers. In the case of proteins the monomer is the amino acid, while in the polysaccharides can be glucose molecules.
The process of polymer formation is called polymerization, and one of the reactions that this process allows is polycondensation, where a water molecule is lost in the union of monomers.
The loss of water in a chemical reaction involves dehydration, a characteristic shared by the processes of adding monomers to proteins and polysaccharides.
The other options are not correct, because
Hydrolysis produces the rupture of molecules, with the intervention of water.Only polysaccharides are sugars bound by the dehydration synthesis process.Only proteins consist of amino acids linked through the process of hydrolysis.If there is 24% adenine present in a dna helix how much thymine would be present
Answer:
24 % Thymine (T)
Explanation:
Chargaff's rules indicate that in double-stranded DNA, the proportion of Adenine (A) is equal to the proportion of Thymine (T), while the proportion of Guanine (A) is equal to the proportion of Cytosine (C). Since double-stranded DNA has 24% A, it means there will be 24% T.
Moreover, in this case, the A + T content in the double-stranded DNA is 24 + 24 = 48%, while the G + C content is 48 - 100 = 52%, i.e. G = 26% and C = 26% (26 + 26 = 52).
What is the function of a fruiting body?