C. The presence of predators could cause natural selection because it would mean survival of the fittest.
I think its because vaccines are just to help your body learn how to fight off the virus, it’s not to actually give you the virus. Hope this helped!
an increase in atmospheric carbon dioxide
Answer: D
The answer is.....Type I or convex curves are characterized by high age-specific survival probability in early and middle life, followed by a rapid decline in survival in later life. They are typical of species that produce few offspring but care for them well, including humans and many other large mammals.
