A wire perpendicular to the screen carries a current in the
direction shown.
What is the direction of the magnetic field at point Z?
Ó.:
up
down
left
right

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.

Iam pretty sure the answer is friction