Both alleles (factors) for a trait are the same and recessive

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

What causes temperature extremes in the desert

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?