English, 10.12.2020 18:10 joshuakirby
Oxygen is one of the most essential elements found on Earth. Humans and all living things depend on oxygen for survival. This vital element is obtained
different ways. The primary source for oxygen is from the ocean, which gives more than fifty percent of Earth's oxygen and most come from tiny ocean
surface plants called phytoplankton. In the process of photosynthesis, phytoplankton releases oxygen into the water. Photosynthesis is also the process
used on land by plants, grass, and trees to convert the sun's energy and nutrients to be released as oxygen. Other forms of oxygen are in the Earth's crust
and minerals, and do not contribute to the oxygen we breathe in the atmosphere.
What does the author imply in the passage?
A Oxygen found in the Earth's crust is important to plant life.
СВ. The only source of oxygen in the atmosphere is from photosynthesis.
C. There would be enough oxygen in the air without phytoplankton,
D. Oxygen cannot be produced without plants and trees.
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Oxygen is one of the most essential elements found on Earth. Humans and all living things depend on...
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