Page 98 - Science Course 3 (Book 1)

Mo2-L7c: What are the Cycles Happened in the Ecosystem?

Oxygen Cycles Carbon Cycles

Oxygen also cycles through the environment. Carbon, a fundamental building block for all living
things, also cycles through the environment.

Producers release oxygen gas and consumers take it in.
When producers use carbon dioxide during
Plants release oxygen as a waste product of photosynthesis, carbon is removed from the
photosynthesis. atmosphere.

The oxygen enters the atmosphere, and many Consumers eat these producers and release carbon
consumers take it in when they breathe. back into the environment as a waste product
Producers again remove the carbon from the
atmosphere as they continue making food, and the
cycle continues.

SUMMARY

What are the Cycles Happened in the Ecosystem?
An energy pyramid shows how much food
energy is available to organisms at each level
of a community.

When organisms exhale, they release carbon dioxide,
which contains oxygen and is a by-product of cellular
respiration.

Some producers take in carbon dioxide, and the
cycle continues.

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