Suppose a flock of gulls that arrive on the island as newborn tortoises emerge from their shells. Half of the total tortoise offspring population is eaten: half of the long and half of the short. How would this affect the variation of alleles that are available to be passed on to the next generation? Be specific.​

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explanation:

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i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.