5. What did scientists find that proved 10,000 years ago some Sticklebacks fish
had this same pelvic
mutation?

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.

layer 3 is younger than layer 6.

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.