This organism is big, multicellular, is photosynthetic and it looks green. It is a member of Kingdom:

Who is credited with developing the binomial system of scientific names?

Two species of squirrels live on either side of the Grand Canyon, and thus they never have an opportunity to interbreed. They are an example of:

A group of organisms that can interbreed with each other in nature, but which cannot breed with any organisms outside their group are called a:

Two populations that reside close to each other, and in which there is some gene exchange between the populations, are an example of:

A wolf eats a rabbit that eats grass on a prairie in Wisconsin. The wolf is a:

Which one of the following statements about evolution is false?

Imagine a population of monkeys in South America whose habitat has been reduced to the point where only 25 monkeys are left, from the original 6,000. This is an example of:

Which of the following has the most complex level of organization?

A scientific experiment may show that the initial hypothesis on which the experiment is based is incorrect.