<span>Scientists found that the cytoplasm of cells undergoing mitosis, if injected into cells at other stages of the cell cycle, could induce the non-dividing cells to start mitosis. This suggested that a chemical signal was present in the cytoplasm of dividing cells that was responsible for "telling" the cells that they should proceed into mitosis. By fractionating the cytoplasm into its components, scientists were able to isolate the signal that triggers mitosis.</span>
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Answer:
The process of respiration in plants involves using the sugars produced during photosynthesis plus oxygen to produce energy for plant growth. In many ways, respiration is the opposite of photosynthesis. As with photosynthesis, plants get oxygen from the air through the stomata
Answer: C
Explanation: Your conclusion always comes last
<span>The most correct choice is (d). Muscle cells, after they have performed heavy work, start to break down six-carbon sugars into energy and lactic acid. In areas where oxygen is present, fermentation will likely not occur, and cellular respiration will take place in its stead.</span>