C because we are testing the effectiveness of Fertilizer X and Y and using no fertilizer can help determine if that would be better than using a fertilizer. Additionally, a control group of no fertilizer would be the third plant as that is considered normal for the experiment. Msg me for any more questions
Answer:
the coldest of all the biomes.
A pair of centrioles make up one centrosome, which a centrosome is considered an organelle. Depending on your course definition of sub-organelle, centrioles may be considered so, however, centrioles are generally regarded as individual organelles.
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