The proposal that one type of organism can change into another type over a long period of time is known as:

Which of the following is true of natural selection?

Evolution through natural selection will occur most rapidly for populations of plants that:

Charles Darwin's theory of evolution by natural selection explains all of the following EXCEPT:

Which branch of biology is concerned with the naming and classifying of organisms?

Biologists can divide living organisms into two groups: autotrophs and heterotrophs, which differ in _________.