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Both carbon dioxide and oxygen found in air enters through the stomata. More at Link
Capillaries. The diffusion of nutrients, oxygen, carbon dioxide and wastes take place in the capillaries. If you want to be more specific, it would be the venous ends of the capillaries where carbon dioxide enters the blood.
Carbon enters the geosphere through weathering of rocks that contain carbon-bearing minerals, such as calcium carbonate. This carbon can then be transferred into the soil through biological processes like plant decomposition. Additionally, carbon can be stored in geological formations through the process of sedimentation and burial.
Pyruvic acid enters and carbon dioxide exits.
Consumers absorb carbon through the food they eat, which contains carbon molecules from plants or other animals. When consumers respire, they release carbon dioxide back into the atmosphere as a byproduct of their metabolic processes. Additionally, consumers can also excrete carbon in the form of waste products.
combustion
it has no choice but to
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Volcanos.
respiration
Volcanos.
it should still be carbon, but too much carbon is bad for the atmosphere. Google: "Carbon in atmoshpere" and see why it's bad
Carbon enters the web of life primarily through photosynthesis, where autotrophs like plants and algae convert carbon dioxide into organic compounds. These autotrophs are then consumed by heterotrophs, passing carbon along the food chain. Carbon is also cycled through decomposers as they break down organic matter and release carbon back into the environment.
All life is based on carbon - it is the main component of biological compounds. It enters life through the atmosphere, through the oceans, and through plants.
Both carbon dioxide and oxygen found in air enters through the stomata. More at Link
Carbon dioxide (CO2) is the molecule that enters a leaf from the atmosphere during photosynthesis.