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Describe how light and sound waves are affected when they move from air to water.
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Contrast how pollination is different among gymnosperms and angiosperms.
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Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled
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What is a population? a. all the members of the same species living in the same ecosystem at the same time b. the number of a species living in the same ecosystem over a period of time c. the total number of organisms living in an ecosystem at a point in time d. all the members of a food web in the same ecosystem
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Describe how light and sound waves are affected when they move from air to water....
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