Aspecies of frog slowly dies off because it cannot compete with the toads and lizards that share its ecosystem. this is an example of
answer
adaptive radiation.
background extinction.
mass extinction.
punctuated equilibrium.

The correct answer would be background extinction

Background extinction refers to the normal or natural extinction which is taking place in an environment.

It refers to the extinction of a species due to ecological factors or environmental changes.

For example, extinction caused by disease, competition, climate change, loss of habitat (due to natural calamity) et cetera.

the answer would be 2, if crossing over doesn’t occur 2 out of 4 of the daughter cells will have that allele.

hope this : )