6. kidneys secrete
, which to regulate blood pressure.
a. renin
b. insulin
...
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The organelle pictured is found in cells of and is theorized to have once been an independent organism.
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Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of
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What property of water provides for appropriate sugar, salt, and amino acid levels to be present and carried in the blood of animals to be delivered to cells
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