Who was the first person to base a system of classification on organisms having similar structures?

Which of these characteristics BEST helps scientists classify organisms?

What process is most responsible for the extinction of most species of plants and animals that have lived on Earth?

Scientists think that dolphins and whales may have evolved from a common ancestor. What evidence supports this hypothesis?

What do transitional fossils best support?

Tigers and household cats are members of the same family; however, their sizes are vastly different. What is the cause of this difference?

Which would best allow a species to survive environmental changes?

Which best describes the relationship between genetic variation and the ability to adapt to one’s environment?

Which evidence would best support the extinction of a past species?

Bird wings and insect wings are analogous structures. Which can most likely be concluded?

The human arm contains the radius and ulna bones. Whales, bats, and dogs also have these bones. Which statement best explains this relationship between the organisms?

What do scientists most often use to form the basis for biological classification?

Who first proposed the theory of evolution by natural selection

Which is the main cause of the variation in traits within a population of organisms?

Which best describes the similar function of wings in birds and butterflies?

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