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yarga [219]
3 years ago
13

What is contamination?

Biology
1 answer:
kari74 [83]3 years ago
3 0
C the presence of harmful substances in food
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The geocentric model says that the earth is at the center of the cosmos or universe, and the planets, the sun and the moon, and the stars circles around it. The early heliocentric models consider the sun as the center, and the planets revolve around the sun.

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How many variables are changed in a controlled experiment
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