The two-layered sac surrounding the heart is the pericardium.
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Question: Many molecules are moved through the body by?
Answer:<u> The molecules are moved through the body by uses special transport proteins to move molecules across the membrane that cannot pass thorough on their own. Usually large molecules. Carrier proteins blind and carry the molecules across the cell membrane. They provide an open channel of passageway through the cell membrane for molecules to move across.</u>
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<em>~A.W~ZoomZoom44</em>
primary production is the synthesis of organic compounds from atmospheric or aqueous carbon dioxide.
Answer:
Because the green bacteria produced oxygen during photosynthesis, the purple bacteria had a harder time surviving.
Explanation:
Sample Answer
