Biology, 14.05.2021 15:30 melinda12ms
1. Compact, complex animals have internal exchange surfaces that are extensively branched or folded, providing a large .
2. In the , nutrients are absorbed across the many fingerlike projections of the lining of the intestine.
3. In the , oxygen and carbon dioxide are exchanged across the epithelial linings of sacs at the tips of tiny air tubes.
4. In the , wastes are removed from the blood across the epithelial linings of excretory tubes.
5. The transports materials between the exchange surfaces of other organ systems and body cells.
6. Body cells are bathed in , and exchange between body cells and the blood takes place through this fluid.
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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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1. Compact, complex animals have internal exchange surfaces that are extensively branched or folded,...
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