Q: What is critical for the formation of hemoglobin? Choices: - salts - proteins - platelets - iron ions A:
iron ions
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Q: What type of science is the study of matter and energy and includes chemistry and physics? Choices: - biology - Earth science - genetics - physical science A:
physical science
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Q: What causes a lot of geological activity on the earth? Choices: - landslides - weather - natural selection - plate tectonics A:
plate tectonics
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Q: An ecosystem consists of all the living things and what? Choices: - living environment - phosphorescent environment - local environment - nonliving environment A:
nonliving environment
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