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.
Go over materials that where gaven to you and maybe ask your teachers about the subject on the test but just come prepared and be ready for all that you learn about
The answer to this is the nucleus
