<span>A retrovirus is anything of a group of RNA viruses that insert a DNA copy of their genome into the host cell to replicate.
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Explanation:
charles darwin proposed thoery of natural selection.he had collected imnumerable specimens of plant and animals.he published concept survival of fittest. while explaining he says that There is always competition for food.only those organism survive which shows adptations in various reasons. it thoery of natural selection.
There are some objections,
1. natural selection is not only factor responsible for evolution.
2. darwin did not mention uesful and useless modifications.
3. There is no explanation about slow and abrupt changes
Answer:
The cell cycle best repairs organism from a puncture wound.
Explanation:
Repairing in organism means restoration of damaged tissue and its functioning. In a cell cycle, a tissue is repaired through the process of Mitiosis in cell division. It helps in growth of cell.
Through this process identical cell copies are produced by which the punctured wound or damaged tissue is replaced. Thus, cell cycle is seen in playing an important role in repairing an organism.
Answer: The correct answer is D
Explanation:
As long the progression of the cell to the M phase of the cell cycle is controlled by the chemical signals in the cytoplasm, then a cell in early M phase fused with a cell in G1 would result in the chromatin in prep of nuclear division in both cells to be condensed.
Answer:
Hydrogen
Explanation:
Basically, stars are big exploding balls of gas, mostly hydrogen and helium.
