The fossil record shows that the average size of black bears was large during cold glacial periods and got smaller during warmer time periods. What is this an example of?

Why do a chicken embryo and a cow embryo look very similar even though the adults do not?

Populations of organisms that exhibit a high degree of variation have a greater chance for survival than populations of organisms that show little variation. This statement is

What hypothesis did Darwin investigate by studying the breeding of pigeons with distinctive traits?

Darwin’s finches evolved on an island. What is the main reason that islands often provide good examples of evolution?

In rock layers, jellyfish fossils are found lower than trilobite fossils, and trilobite fossils are found lower than ammonite fossils. What can be determined from this information?

Which factors affect natural selection?

Carlos collects data about the length of earthworms in his backyard. The shortest worm he found is 4 inches long; the longest worm is 8 inches long. If most of the worms are either short or long, which type of distribution is shown in the population?

What is most likely to happen to a population of mice that becomes isolated on an island?

The wing of the bat and the fore-limb of the dog are said to be homologous structures. This indicates that

Marine mammals have many structural characteristics in common with fishes. The explanation that evolutionary theory would give for this similarity is:

The population of Florida panthers has been drastically reduced by the actions of man. Which of the following most likely threatens their ability to continue to evolve in response to the pressures of their environment?

A sudden major climatic change would most likely initially result in

The extinct species Archaeopteryx had characteristics of both birds and reptiles. This is an example of a(n)

Which of the following is not a part of Darwin's theory of natural selection?

Features that increase the likelihood of survival and reproduction by an organism in a particular environment are called

A structure that seems to serve no purpose in an organism is called:

A group of mice becomes separated by the formation of a river. Over time, the northern mice became smaller and whiter, while the southern mice became larger and browner. This is an example of

The dog breeds we have today were developed through:

The finches on the Galapagos island were similar in form except for variations of their beaks. Darwin observed that these variations were useful for

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