Velocity and acceleration are both vectors; they have a direction. What is the direction of the velocity and
acceleration vectors of a tennis ball that is falling downward
from its highest point towards the ground? Pick two answers.

Iwas going to ask that quesytion  sorry dude i dont  know : (    : /

Not what goes around on earth but the universe too.

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.