Human activities have which type of impact on the environment? a) positive
b) negative
c) neither a nor b
d) both a and b

Which of the following occurs most often in a population when genetic variation and overproduction are present? some organisms have a lower reproductive success than others. some organisms have a higher reproductive success than others. some organisms have no reproductive success. some organisms do not have genetic variation.

In the water cycle , when does water undergo a chemical change

What is the farthest destination to date for a human spaceflight mission?