Scientists in the United States, Europe, and Africa have now suggested that the hippopotamus is a relative of the whale. Earlier studies placed the hippo as a close relative of wild pigs, but recent studies have discovered stronger evidence for the c

A stable ecosystem would not contain

Many viruses infect only a certain type of cell because they bind to certain

The respiratory system includes a layer of cells in the air passages that clean the air before it gets to the lungs. This layer of cells is best classified as

Abiotic factors that could affect the stability of an ecosystem could include

Mustard gas removes guanine (G) from DNA. For developing embryos, exposure to mustard gas can cause serious deformities because guanine

Which observation could best be used to indicate an evolutionary relationship between two species?

Limited resources contribute to evolutionary change in animals by increasing

A species in a changing environment would have the best chance of survival as a result of a mutation that has a

German measles is a disease that can harm an embryo if the mother is infected in the early stages of pregnancy because the virus that causes German measles is able to

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