Answer:
D - Flowering plants and ferns have a more recent common ancestor than they do with spike mosses
Explanation:
For climate change, global warming can be a large factor
I think it would be A because none of them can be dominant over the other since the heterozygous did not take a side.
The correct answer is by using the antagonist.
The antagonist is a molecule that blocks a biological response by binding to the receptor. So, you add antagonists to the receptors you want to determine and see which antagonist blocked the response. By blocking the specific response you can get the answer what receptor it was.