What happens as a river gets older

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

Organisms are classified, or grouped into categories, based on similarities in their characteristics and/or evolutionary relationships. the study of how organisms are classified is known as

Restriction enzymes are used in making recombinant dna. describe the role restriction enzymes perform when constructing recombinant dna.