The answer is Carbon Dioxide. Oxygen is created during photosythesis. :)
C is the answer for this one.....it would gravitate towards the sunshine
They classify on how they reproduce.
Answer:
Microscopic marine phytoplankton play a critical role in regulating todays carbon cycle yet not enough is known about the process. These tiny organisms consume carbon dioxide from atmosphere and move it to marine sediments in deep ocean. And this process is also known as biological pump<em>.</em>
Explanation:
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To only allow through certain items, and block the rest.
