The term means abnormally increased muscle function or activity.

answer: populations of walruses and polar bears will decline

explanation:

you put it

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.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

c. heat from the poles back down towards the equator.