Why was natural selection an important contribution to the theory of evolution?

Describe at least 2 abiotic and two biotic factors found in the desert biome how do these abiotic factors interact with the biotic factors

The reactions that occur in the ribosome, where amino acids are combined to form proteins are anabolic or catabolic?

Use the phylogenetic tree to the right to determine which statement below is true. organisms a and f are not related. organism e is more closely related to organism b than organism f. organisms c and d are more closely related than organisms a and b. phylogenetic trees