Biology

What organ filters blood and helps regulate salt and water levels?

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What is the opening in your eye called?
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Fish take in oxygen through their gills; what do insects take in oxygen through?
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What helps make the waxy oil substance for your skin and hair?
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What is the function of the endoplasmic reticulum in a cell?
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A change of DNA in an organism that results in a new trait is known as what?
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What is a similar group of animals that can breed with each other called?
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Which of these is not part of a plant?
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What is the common cold caused by?
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