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Regulation and maintenance of constant internal conditions in an organism

A. Hemoglobin
B. Photosynthesis
C. Hypothesis
D. Homeostasis

User Jim Doyle
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The answer is D homeostasis. For A, hemoglobin is a protein exists in blood and can bring oxygen. For B, photosynthesis is a process of converting CO2 to glucose using the energy of light. It occurs in chloroplast. For C, hypothesis means suppose.
User Ignat Insarov
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