Flatworms absorb oxygen by diffusion mechanism through their
skin to the cells in their bodies. Since flatworms do not have a circulatory system,
their bodies' cells are positioned close to the skin to ease the uptake of
oxygen from surrounding fluids or water.
Cancer is cell replication gone wrong. It is when a cell attempts to reproduce itself, but something went wrong in the duplication of splitting process. The are connected because they are both cellular reproduction.
Without further context I would assume the answer here is: Hydroxyl groups.
Answer:
saliva in your mouth or mucus in your nose
Explanation:
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