Q: Where does digestion take place within an incomplete digestive system? Read this paragraph and choose the correct option from the provided answers: Flatworms have an incomplete digestive system. This means that the digestive tract has only one opening. Digestion takes place in the gastrovascular cavity. Choices: - lumbar region - abdomen - central nervous system - gastrovascular cavity A:
gastrovascular cavity
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Q: How do mammals generate heat? Read this paragraph and choose the correct option from the provided answers: Mammals generate heat mainly by maintaining a high rate of metabolism. Compared with the cells of other animals, the cells of mammals have more mitochondria. Mitochondria are the cell organelles that generate energy. Mammals may also produce little bursts of heat by shivering. Shivering occurs when many muscles all contract slightly at the same time. The muscle contractions generate a small amount of heat. Choices: - running around fast - eating spicy foods - maintaning low metabolism - maintaining high metabolism A:
maintaining high metabolism
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Q: The two parathyroid glands are located behind what gland? Read this paragraph and choose the correct option from the provided answers: The two parathyroid glands are located behind the thyroid gland. Parathyroid hormone helps keep the level of calcium in the blood within a narrow range. It stimulates bone cells to dissolve calcium in bone matrix and release it into the blood. Choices: - thymus - pituitary gland - hypothalmus - thyroid A:
thyroid
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Q: Overproduction of offspring, combined with limited resources, results in what? Read this paragraph and choose the correct option from the provided answers: Choices: - continuation - contention - concentration - competition A:
competition
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