Master genes that affect development tend to be highly ; therefore, similarities in patterns of embryonic development reflect shared ancestry that can be evolutionarily ancient.

Master genes tend to be conserved.

Explanation:

Master genes, which are the genes in the DNA that control major development processes such as the development of the skeleton, the organs etc and the production of the necessary proteins.

Since they take on such an important role, they don't really change much. Master genes that affect development tend to be highly conserved so embryonic development can show similar patterns.

I hope this answer helps.

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.

the answer is d p: cell, q: organ, r: organ system, s: tissue