how carbon gets from the atmosphere into living things.

Carbon moves from the atmosphere into living things mainly through photosynthesis in plants, algae, and some bacteria, and then it spreads through food chains as organisms eat one another. Eventually, much of that carbon returns to the air through breathing, decay, and burning, completing what is called the carbon cycle.

From air into plants

• Green plants, algae, and some bacteria take in carbon dioxide (CO₂) from the air through tiny openings in their leaves or cell surfaces.

• Using photosynthesis , they use CO₂, water, and sunlight to make sugars (like glucose) and build their tissues (leaves, wood, roots, etc.).

In short: sunlight powers plants to “grab” carbon from the air and lock it into their bodies.

Into animals and other consumers

• Animals cannot pull CO₂ directly from the air to build their bodies, so they get carbon by eating plants or other animals.

• When a herbivore eats a plant, the carbon in the plant’s sugars and other molecules becomes part of the herbivore; when a carnivore eats the herbivore, that carbon moves again into the predator.

What happens inside living things

• Inside cells, organisms use cellular respiration : they break down carbon-rich food molecules to release energy for life processes.

• During respiration, some of that carbon leaves their bodies again as CO₂ that is exhaled back into the atmosphere.

When organisms die

• When plants and animals die, decomposers (like bacteria and fungi) break down their bodies, using the carbon in them as food.

• As decomposers respire, they release CO₂ back to the air, and some carbon becomes part of the soil and can stay there for years to centuries.

Longer-term storage

• Over very long times, some carbon from dead organisms is buried deeply and, under heat and pressure, can turn into fossil fuels such as coal, oil, and natural gas.

• When people burn these fuels, that long-stored carbon is released quickly as CO₂, adding more carbon back into the atmosphere and altering the balance of the carbon cycle.

TL;DR: Carbon leaves the atmosphere as CO₂ when photosynthetic organisms use it to build their bodies, moves through food webs as living things eat each other, and then returns to the air through breathing, decay, and burning, cycling continuously between air and life.