Answer: The answer is 4
Explanation:
Vitamin D controls your skin pigment. It's kind of like when someone has an iron deficiency they get bruises and they turn a whiter shade.
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Answer:
Organisms mainly use two types of molecules for chemical energy: glucose and ATP. Both molecules are used as fuels throughout the living world. Both molecules are also key players in the process of photosynthesis.
Explanation:
Answer:
I think it's - A chicken learns that if it pecks on a button, a food pellet will be released into its cage.
Answer:
veins
Explanation:
Arteries carry blood away from the heart and veins carry blood back to the heart.