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It marks the start of fall.
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Answer:
C Bacteria provide nitrogen
Nucleic acids also typically contain phosphorous, and nitrogen plays an important structural role in nucleic and proteins. The proteins, being made up a diverse set of amino acids, have, in addition to carbon, hydrogen, oxygen, and nitrogen, the elements sulfur and selenium.
Answer:
A hypothesis is an educated guess about something in the world around you. It should be testable, either by experiment or observation.
For example: A new medicine you think might work.
Explanation: