What must all living things do?

Answer 1

To stay alive, all living things must do 4 things:

1. Exchange gasses. For humans, it is breathing in oxygen and breathing out carbon dioxide. If we do not do this, we die in minutes. For plants, they release oxygen, and take in carbon dioxide. For microbs, such as a paramesium, you exchange gasses through microscopic holes in the cell.

2. Eliminate waste. In other words, go potty. It may sound silly but your body would not do well if you didn't do this. You also can eliminate waste with flatulance. If you refuse to go, you hold it in and get that unpleasnt feeling. Then you feel you back side starting to hurt, where your kidneys are located. Then your organs shut down. This is a painful death i would suggest to no body. In all this processs, you would have only hours to live.

3. Water. Everyone knows you can drink it, but also you can eat it through different foods. In micro organisims (microbs), they get water through the microscopic holes I mentioned before. In plants, they get it through the grounnd from the roots. Without water, humans would only have days.

4. Energy. For humans, food. Of course, we humans eat. Some micro organisims, such as a paramesium have a "gullet" where food comes in. In plants, they get it through a process called "photosynthesis", where sunlight comes to the plant, and the chlorophil makes the sunlight into food. This explains the green color of plants.

(Please note these are in the order of need for a HUMAN. Plants, fungi, bacteria and proteista differ in needs.)

Also there are 3 things a living thing can do, but doesnt need to.

1. Grow. I don't need to explain this.

2. Move. Neither this one.

3. Respond to encironment. This is talking, gestures, alot of different things.

Hope This helps!!

Answer 2

eat food from their mouth

release energy from their food.

consume foods from all the major food groups

digest their food in their stomachs