Look it up if you are stressing.
Smallest to largest- molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere.
Not sure which 7 you're looking for
Answer:
the Latin word for fire form when hot, molten rock crystallizes and solidifies.
Explanation:
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<u>Answer:</u>
<h3>
<u>T</u><u>he process of inhaling(breath in) and </u><u>exhaling</u><u> </u><u>(breath out)</u><u> </u><u>of</u><u> </u><u> oxygen and carbon dioxide is called respiration </u><u>.</u></h3>
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have a great day mate! :)

The unit of time based on the revolution of the Earth around the Sun is called a Year.
The unit of time based on the Earth spinning around completely once on its own axis is called a Day.