Air becomes wind as it flows from
a. low pressure to low pressure.
c. low pressure to high pressure.
b. high pressure to high pressure.
d. high pressure to low pressure.

correct answer is option d (high pressure to low pressure.)

Explanation:

Air:

Air is the mixture of  various gases like oxygen, carbon dioxide and nitrogen. These mixture of gases are present in the atmosphere.

Wind

When air started moving in horizontal direction due to pressure difference between two points. When air flows from high pressure to low pressure area  it became wind. Wind has both direction and speed.

Therefore air becomes wind as it flows from high pressure to low pressure

i would think it's food chain

truck y has a greater velocity than truck x.