Which types of organisms would natural selection favor most if earth had another ice age?

Natural selection would favor organisms with lots of fur, such as white furred bears.

Explanation:

Since the ice age was very cold, and it will be cold again, organisms suited more towards living in the cold will be more likely to live and pass down their genes.

cell regulation is conducted by special proteins.

compost can be added to topsoil as a:

pesticide