The most important trait that modern fish had developed was the transformation of their skeleton from cartilage to bones. This was called ossification. Eventually, bony fishes and sharks dominated the waters because their body structure development which helped them as swimmers is advanced compared to earlier fishes.
Genetic variation is the answer to ur question
Every thing in the ocean coral, rocks, whales, sea plants..etc..
You take the two numbers and you find a number that can be divide into both of those numbers. I am in 7th grade. I can help you if you need it
