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What is the term for a group of organisms that are able to interbreed and produce fertile offspring? A. genus B. ecosystem C. population D. biological species Which is an example of a population? A. one of the trees in a forest B. all the gray squirrels that live in a forest C. each individual in a herd of bison D. all the individuals that make up a species Scientists discovered that the Albert's squirrels became two separate populations during the Grand Canyon's formation; they are now known as the Albert's and Kaibab squirrels. Their traits differ, and scientists agree that in the future they may no longer be able to breed with each other. If this occurs and breeding can not happen, what will this be an example of? A. natural selection B. speciation C. spontaneous generation D. succession Which process can lead to speciation? A. Over time two populations may differ in their diet and behavioral adaptations but can still mate and produce offspring. B. Two populations become reproductively isolate; no inter-mating occurs. C. Over time populations may differ only in coat color or limb length. D. Over time two populations will occasionally interbreed. What is Charles Darwin's major contribution to science? A. He explained how species evolve. B. He performed an experiment showing how molecular compounds first formed. C. He showed DNA is passed from parents to offspring. D. He categorized thousands of species to compare their different traits. Which supports the hypothesis that life has changed over time? A. The length of a giraffe's neck is longer than those in generations of the past. B. Organisms differ from each other around the world. C. The atmosphere from today and years ago is different. D. Prokaryotic and eukaryotic cells differ in that both do not have a nucleus.

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