Asap is i don't finish soon i wont get to hang out with my best friend this !

I'd say first question, "life changes over time".
Second question, "when there are physical similarities in the early stages of embryonic development, it suggests that each of the modern organisms once had a common ancestor".
Third, appendix.
Fourth, "they are evidence that all came from a common ancestor and that life changed over time for all these organisms to exist".
Fifth, "they all share at least 50% of the same DNA arrangement".

I might be a little late but hopefully this helps!

C) to ensure each new cell has an exact copy of the dna

The basic building blocks of dna and rna are nucleotides