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Question: 20 while studying crabs preying upon snails in tidepools on...

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20. While studying crabs preying upon snails in tidepools on the California coast, you collect the data in the figure below on snail size, energy content, and how long it takes for the crab to remove the snail from its shell (handling time). 2 Handling time 6 (minutes) Energy content (g of meat) 0 0 0 2 4 Snail size (cm in length) a. Based on the data you collected, what size of snail prey would you predict the crab to prefer, based on optimal foraging theory? Explain your answer. b. As you continue your research, you find that crabs in your population prefer a different size of snail than what you predicted in part a. What factors might cause crabs to choose these snails instead of the size you predicted? 21. Increases in greenhouse gases in the atmosphere increase the amount of heat energy retained in the atmosphere. The ocean absorbs about 93% of this increase in energy, as well as about 25% of the CO2 molecules that are released by human activities. How are
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