The main source of carbon dioxide in an ecosystem is the carbon dioxide gas present in the atmosphere. This carbon dioxide is used by the plants and animals in different ways.
The plants use this carbon dioxide to perform the process of photosynthesis.This is carried out by the help of green pigment called chlorophyll that absorbs light from the sun, water from soil and carbon dioxide from atmosphere.
The carbon in animals comes when they eat these plants.
If you put a rock in a slingshot and draw back the rubber band the rock will fly out at a predictable speed depending on the distance that the rubber band is draw back. this is an example of the following
law
Since due to having the coronavirus, the immune system is already tired of fighting off such a tough disease. Since it's so weak, one small bacteria can make your body react to it in ways you wouldn't think it may, because the immune system isn't working much.