<u>changes </u><u>in </u><u>abiotic </u><u>factors</u> is the most appropriate answer for this question.
Hope it helps you...
(by Benjemin)
I’m pretty sure it’s the first option, if not I am so sorry.
Each bone has a humerus. The ones that have these bones are humans, lions and birds
This is possible by having different stem cells for different types of cells which then have different genes activated to make cells different