Biologist -c geologist -b chemist-d hydrologist-a
Answer:
A) the origin of eukaryotes
Explanation:
The Endosymbiotic theory talks about how the ancestors of modern eukaryotic cells were once 2+ prokaryotic cells. This theory says that one prokaryotic cell basically lived inside another prokaryotic cell and these cells formed a long term relationship. The prokaryotic cell eventually became a permanent part of the host and eventually evolved into modern day eukaryotic cells.
The most efficient procedure that scientist can use to obtain more recombinant dna for a particular trait is : Clone the recombinant dna in a biological vector. This method will give more assurance that they will get the traits that they wanted form the subjects
hope this helps
I believe the answer is UNAIDS. hope this helps!