Answered

Carbon dioxide makes up less than
1 percent of Earth's atmosphere, and
oxygen makes up about 20 percent.
These percentages are maintained
most directly by
(1) respiration and photosynthesis
(2) the ozone shield
(3) synthesis and digestion
(4) energy recycling in ecosystems



Answer :

GinnyAnswer

Final answer:

The percentages of gases in Earth's atmosphere are most directly maintained by respiration and photosynthesis.


Explanation:

Respiration and photosynthesis are the processes that most directly maintain the percentages of gases like carbon dioxide and oxygen in Earth's atmosphere. Plants produce oxygen through photosynthesis and remove carbon dioxide through this process and respiration. This balance is crucial for sustaining life on Earth.


Learn more about Respiration and photosynthesis in Earth's atmosphere here:

https://brainly.com/question/19017186


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