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A drug is any chemical substance that alters the body physically or mentally for a non - nutritional purpose.
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I think it's oxygen and water because they are the substance for cellular respiration.
Answer:
A recent study has shown an increase in the number of predators in an ecosystem. Which of the following is not a possible cause for the growth?a.An increase in the land space availableb.An increase in the population of prey it feeds onc.An increase in the biodiversity of the ecosystemd.An
Explanation: