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20. Which of the following describes a population? a.Dogs and cats living in Texas b.Four species of fish living in a pond c. dogwood trees in Connecticut d.Roses and tulips in a garden

22. Natural selection could not occur without a.Genetic variation in species b.Environmental changes c.Competition for unlimited resources d.Gradual warming of Earth

24. Natural selection causes a.Changes in the environment b.Plants and animals to produce more offspring than can survive c.Changes in the frequency of certain alleles in a a population d.All of the above

26. According to Darwin, evolution occurs a.By chance b.B. During half-life periods off 5,730 years. c.Because of natural selection d.rapidly

28. Natural selection is the process by which a.The age of selected fossils is calculated b.Organisms with traits well suited to their environment survive and reproduce at a greater rate than less well-adapted organisms in the same environment c.Acquired traits are passed on from one generation to the next d. all of the above

32. Darwin’s theory about how life changes over time is now called the Theory of _____________

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