The food chain will mess up.
It gets taken over by the dominate allele because the recessive allele is weaker than the dominate one so the dominate always take over the recessive if there is a domininate and a recessive involved if it's two recessive its recessive if it's two dominate it's also dominate
I think it’s D. A large amount of humans.
And B. Temperatures of 5-10 degrees. I’m not sure sorry if it’s wrong.