Apatient repeats, "i feel hot. hot, cot, rot, tot, got. i'm a spot." the nurse documents this as an illustration of:

Which is an example of a population?

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above