Decomposers are necessary in a food chain
because they
(1) manufacture food by photosynthesis
(2) return nutrients to the ecosystem
(3) absorb energy from the sun
(4) produce organic nutrients

Asegment id dna that is artificially created from two or more organism through use of dna enzymes in a laboratory is called a segment of dna that is artificially created from two or more organisms through use of dna enzymes in a laboratory is called