8. what happens to the amount of dna in the nucleus just
before the beginning of mitosis and why?

The amount of DNA doubles in the nucleus just before mitosis. The DNA makes a copy of itself. Due to this, the chromosomes are sometimes called 'double chromosomes' just before mitosis.

The DNA material doubles before mitosis so that each daughter cells receives the same amount of DNA. This process ensures that each of the daughter cells formed has the same type and amount of genome as the parent cell. So, it is very important for the DNA to undergo replication before the process of mitosis begins.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

and after water is usually warmed by the sun the water temperature raises and then evaporates .