Where do most human inputs of outdoor air pollutants occur?
in the mountains
around oceans
in deserts
in urban areas

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.

The “ecological footprint” left by a citizen of a developed nation is about four times larger than that left by a citizen of a developing nation. why is this the case?

Which of the following explains why a tree is often used as a model to represent the principle of common descent