When two or more species live in together in close long term relationship it is called?

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen

Recombinant dna (rdna) creates offspring which are genetically identical to the parent is the process of breeding only organisms with desirable traits involves the removal of the nucleus of a cell combines genes from organisms of different species in a lab