Knowledge of genetics did not yet exist in Darwin's time, so genetic theory has since been used to explain natural selection. In addition, Darwin believed that evolution progressed at a slow, steady rate. However, that idea has been replaced by the punctuated equilibrium model, in which major changes in brief spurts.
(Mark this as the brainliest answer if this helps!)
Answer:
Dead
Explanation:
without genetic variation nearly all species would have died from new climates, diseases, and other threats which surround them. One could say we would live in a utopia, however, utopian societies cannot exist when all species of plants and animals are dead.
It directly relaxes vascular smooth muscle, allowing dilation of peripheral arteries and veins.
1. A minute cylindrical organelle near the nucleus in animal cells, occurring in pairs and involved in the development of spindle fibers in cell division.
2. Centrioles are paired barrel-shaped organelles located in the cytoplasm of animal cells near the nuclear envelope.
3. Centrioles play a role in organizing microtubules that serve as the cell’s skeletal system.
4. They help determine the locations of the nucleus and other organelles within the cell.
Answer:
James Watson and Francis Crick solved the structure of DNA. Rosalind Franklin and Maurice Wilkins, also contributed to this discovery.
Explanation: