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Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain
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The “ecological footprint” left by a citizen of a developed nation is about four times larger than that left by a citizen of a developing nation. why is this the case?
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Biology, 22.06.2019 09:30
What's wrong with this ecological pyramid? (multiple choice)1. secondary consumers should be at the bottom of the pyramid2. the sun has an arrow leading to decomposers 3. primary consumers should come after the sun4. energy retained should increase from the bottom to the top5. the sun should be at the bottom of the pyramid
Answers: 1
HEL
Which of the following are extra senses that vertebrates may have? (Choose all that apply)
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