Easy. Answer is oxygen because it says which one was missing before any life was on earth. And in order to have life on earth you need oxygen!
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Answer:
These seed plants fall into two groups, angiosperms and gymnosperms. Angiosperms are the flowering plants. Their seeds develop inside a female reproductive part of the flower, called the ovary, which usually ripens into a protective FRUIT.
Explanation:
it often supply energy and other nutrients and fiber that the body needs.
Answer:
<em>A team of astronomers discovers a new planet with water. They notice that the process of evaporation does not seem to be working on this planet. Which statement best explains the state of the water cycle on this newly discovered planet?</em>
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<em>The water is trapped as water vapor in the atmosphere and clouds.</em>
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<em>Hope this helps!</em>
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