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GuDViN [60]
2 years ago
13

What does a controlled experiment work with?

Biology
1 answer:
GREYUIT [131]2 years ago
5 0

a variable is the right answer

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Melanin is the pigment which absorbs UV light and it is present in skin and gives black colour to it.As we can see africans usually have black skin as they have to face direct uv light.

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