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When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection
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Coral reefs support more species per unit area than any other marine environment on earth. what is one way coral reefs are important to the health of the biosphere
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An ecologist studied the same species of deer during the summer and the winter. she noticed that during the summer, when there was plenty of food, the deer were energetic and playful. however, during winter when food was scarce, the deer moved more slowly and did not run unless they needed to escape a predator. which scientific fact is best supported by her observations?
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Which of the following muscles can you control:
Biceps
Quadriceps
Deltoids
All of...
Quadriceps
Deltoids
All of...
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