Hibernation Explanation it just is
Mitosis form of cell division marks in an enlarged germ cell pool, Mitosis is a procedure where a single cell splits into two identical daughter cells (cell division).
<h3>What is mitosis and meiosis?</h3>
There are two kinds of cell division: mitosis and meiosis. Most of the time when people refer to “cell division,” they mean mitosis, the procedure of making new body cells.
Meiosis is the kind of cell division that creates egg and sperm cells. Mitosis is a actual procedure for life.
Thus, Mitosis form of cell division marks in an enlarged germ cell pool, Mitosis is a procedure where a single cell divides into two same daughter cells.
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The mechanisms of reproductive isolation prevent the reproduction of two individuals from different species. The prezygotic mechanisms disrupt the stages of reproduction before the forming of the zygote or prevent the mating at the start, and the postzygotic mechanisms affect the stages of reproduction after the forming of the zygote.
So, the first and the third example (the urchins and the grasshoppers) show the prezygotic mechanism, as the two individuals are not able to mate or form a zygote.
The second and the fourth example ( zonkey and the death of a zygote) show the working of the postzygotic mechanisms, as the zygote is formed, but it seems to be inviable, and the zonkeys are sterile, preventing the individual to reproduce.
Answer: During the Cambrian Explosion of Animal Life
