Which of these transport processes is operating in the transmission of a nerve message from the fingertips to the brain? answer sodium-potassium pump diffusion exocytosis all of these are involved in the transmission of a nerve message my answer is a.

The sodium-potassium pump  

Explanation:

Nerve impulse transmission is an electrochemical phenomenon that occurs in nerve cells and makes the nervous system work. It is the result of changes in electrical charges in the membrane of neurons, cells specialized in information processing.

Electric charges move in neurons like ions, mainly sodium (Na +) and potassium (K +). These ions cross the plasma membrane of the neuron through protein channels and ion pumps, which are embedded in the phospholipid bilayer of the membrane.

The sodium-potassium pump inserted in the membrane moves the ions against their concentration gradient, it takes the sodium and puts the potassium inside the cell and for that there is an energy expenditure. For this reason, we can say that pumps and sodium and potassium are responsible for transmitting a nervous message from the fingertips to the brain.

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.

i think it is dna, i'm not totally sure but i think it might be.