Answer:
Ectotherms are also called poikilotherms.These are animals whose temperature varies with that of the external temperature.
Explanation:
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An essential nutrient<span> is a </span>nutrient<span> that the body cannot synthesize on its own -- or not to an adequate amount -- and must be provided by the diet. These</span>nutrients<span> are necessary for the body to function properly. On the other the non-essential ones cannot be made inside the body so they are acquired from the food we eat.</span>
B. the organism's physical traits
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