How do we know what happened on earth before humans were around?

Can a trait be both polygenic and have multiple alleles? explain why or why not.

Recombinant dna is the merging of dna from unrelated organisms to create new genetic varieties is assembled in the lab from mononucleotides was part of the green revolution of the 1960s is pollination of one plant by another of the same species is cross-pollination of one plant by a different species

The most effective way to provide children with safety messages is to