Two balloons are given electrostatic charged by rubbing them with a wool cloth which observation provides evidence of the force that the balloon exerts on each other over a distance because of their charge

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.

the answer is c.) there is a warm front in region a and a stationary front in region b.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

if someone had the list of traits you provided