It is always working.
It even works while the person is sleeping to push saliva down the throat.
All cells contain a nucleus
Explanation is in the pic
Hope it helps
The color may help it to blend in and avoid being eaten by predators and survive long enough to reproduce.
The correct answer is active transport. Active transport entails movement of substances against a concentration gradient and requires use of energy in form of ATP and use of protein pumps. Active transport is used to enhance several activities in the body such as movement of nutrients from the small intestines to the blood stream, this ensures that all the nutrients have moved from the lumen,
