Which of the following describes how dna provides evidence to support that life changes over time

a- some animals exhibit similar stages of embryonic development
b- some animals exhibit structural that are no longer used for any purpose
c- some animals exhibit similar genetic code

Although all are true, it is B.

Vestigial structures indicate that the animals evolved from an ancient ancestor.

The correct answer will be option C.

Explanation:

Chromosome is a packaged structure of DNA observed in the cell nucleus during metaphase stage of cell division when aligned in the equatorial plate of the cell.

Chromosomes number varies in different species which facilitates replication and distribution of the DNA to new daughter cells during cell division.

Chromosome is formed after coiling of DNA many times around proteins called histones which provides the structural support to DNA and form a special structure nucleosomes,  further coil up and create chromatin loops which further coil around each other and make a full chromosome.  

Thus, option C is the correct answer.