What does the trunk of the classic phylogenetic tree represent?
single common ancestor
pool of ancestral organisms
new species
old species

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.

answer; the above answer to the above statement is (true)

a- all cells come from pre-existing cells