Active transport is *ALWAYS* characterized by

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

Spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

The picture represents a structure of the respiratory system. which is the function of this structure? to bring air into the body to exchange oxygen with carbon dioxide to carry air to the lungs to release oxygen from the body