Describing Natural Selection
Which statements best describe natural selection? Check all that apply.
Populations must have genetic variation.
Genetic mutations do not produce advantageous traits.
Natural selection occurs when the environment changes.
Evolution works independently of natural selection.
Organisms best suited for the environment survive and reproduce.

the answer is c     : )

explanation:

i don't have an explanation because i don't know, but i think the answer is c because i googled it and google is right : ) just kidding google isn't allways right but the answer is still c. i hope this !

yellow fever and other tropical diseases

well that depends on how deep the hole is. you'd first go through te crust of the earth, then the upper mantle, then the lower mantle then the outer core, then the inner cor then you'd be stuck in the core to melt.