interact verb [I]. âº to âcommunicate with or âreact to each other: He does not interact well with the other âstudents. interaction noun [C/U] us /ËÉªnÂ·tÉrËaekÂ·tÉrËÃ¦k/ âº [ÊÉn] âc drug. interactions [Noun/C] u /usÂ·ËÉªnÂ·tÉrËaek/. tÉrËÃ¦k ÊÉn
Scientists estimate a safe oxygen consumption of 50 liters per hour for a human. Meanwhile, a leaf gives off about five milliliters of oxygen per hour. A person would need to be in a room with about ten thousand leaves. About 300 to 500 plants would produce the right amount of oxygen.
In the simple example of the oxygen cycle shown above, you can see how oxygen is used and cycled by plants and animals. Plants are the main creators of oxygen in the atmosphere through the process of photosynthesis. Here the tree uses sunlight and carbon dioxide to produce energy and releases oxygen. The giraffe breathes in the oxygen and then breathes out carbon dioxide. The plant can then use this carbon dioxide and the cycle is complete.