Asignal is translated to cause a muscle to contract. of what is this an example?
a, intracellular communication
b, enzyme-linked receptor
c, intercellular communication
d, ion channel-linked receptor

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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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.