Im not sure what the answer is ​

Explanation:

1. d

2. f

3. a

4. b

5. e

6. c

A big variety of organisms’ genomes have genes that control the organisms’ development at different stages. The remains of ancestral traits usually appear at different stages of the embryological development. For example, hair growth and loss, the development and deformation of the yolk sac or appearance and disappearance of gill structures in the embryo development of vertebrates.