Answer:
Because 2 forces are stopping the crate, friction and gravity. While only one force is trying to move it forward.
Because he has both of the blood types but he can't donate because he has mixed blood
Ecological models commonly have limited applications because the models included and the whole of them are from generalizations. And another reason is because ecological models focus on a population level and also an individual level which affects it applications and it caused for limited distributions.
The correct answer is D) The fossil record reveals intermediates that link different species. Hope this helps.