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What is it that surrounds cells and serve to keep the insides separated from the outsides?

asked Jan 6 in Science by RoseannaKeel (630 points)

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What do fungi produce to digest nutrients?

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What connection is required for a newborn baby to begin breathing?

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What do we call a peptide hormone composed of nine amino acids that lowers blood pressure?

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What can autographs do that heterotrophs cannot do?

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What is a type of plant tissue consisting of undifferentiated cells that can continue to divide and differentiate?

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What is continuously changing within a circuit in an analog signal?

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What is considered to be the control center for homeostatic mechanisms?

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What is considered to be the "fundamental unit" of life?

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What is considered the center of the solar system?

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What happens when antibodies are transferred to a person who has never been exposed to the pathogen?

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What is a soft connective tissue inside pores and cavities in spongy bone?

asked Jan 6 in Science by SamaraQ8653 (410 points)

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What bond is the force of attraction that holds together oppositely charged ions?

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What body system gets rid of waste?

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What celestial events are the source of elements heavier than iron?

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What describes how close an estimate is to a known standard?

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What causes the endometrium to thicken during a menstrual cycle?

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What cannot be created or destroyed in a chemical reaction?

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What can sodium ions not pass through?

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What can renewable resources can be replaced by?

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