<span>It would be easier for harmful substances to enter.
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Answer:
Overnutrition is food intake that is continuously in excess of dietary energy requirements
Undernutrition is inability to acquire enough food, defined as a level of food intake insufficient to meet dietary energy requirements.
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D.
variable-ratio schedule of reinforcement.
<span>The </span>function of the valves<span> in the peripheral </span>veins<span> is to ensure that the overall movement of blood in the </span>veins<span> is in the right direction, toward the heart. This is especially important in the </span>legs<span>, where the blood must flow a relatively long distance against gravity. </span>