Which of the following is NOT true of mechanical digestion? (2 points) Muscular contraction in the stomach mix food
The teeth and tongue break food into smaller pieces
It starts in the mouth
Enzymes break down food

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.

a ratio derived from the equality between two different units that can be used to convert from one unit to the other. information obtained from experiments, sometimes called experimental results. the part of the experiment that is affected by the independent variable.