I'm not sure about number 1 or number 6, but I know that 3 is nucleic acid and 5 is solution.
Natural variation provided the phenotypes that natural selection then acted on, over time causing evolution
Answer:G. thurberi
Explanation: because you can really tell. Correct
Answer: Well, populations never evolved than one human might have gone extinct due to many different viruses and sicknesses but other animals might not be extinct. If populations never grew more then that would be because we could not overpower dome viruses. If we never. If we never evolved animals like a Carrier pigeon would not be dead or extinct today.
The primary hormones involved in the functioning of the male reproductive system are follicle stimulating hormone (FSH),Luteinizing hormone (LH) and Testosterone.
Hope this helps.