A student conducted an experiment in science class by placing a closed plastic baggie of starch into a large container of iodine. The next day, the student noticed the starch in the baggie was black. After further investigation, the student discovered that iodine turns starch black. If the baggie was closed, how did the iodine get into the baggie of starch? Explain your answer.

The iodine might have got into the bag by the process of diffusion/osmosis.

In the process of diffusion, particles move from an area of higher concentration to an area of lower concentration along a concentration gradient.

As we know, the iodine solution in the large container had more particles of iodine whereas the baggie had none of the iodine solution. As a result, a concentration gradient developed due to which iodine solution moved into the baggie through the process of diffusion or osmosis.

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a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.