Answer: You can tell when a chemical reaction is taking place because it is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change. All these things characterize what you look out for to find a chemical change.
Explanation:
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Answer:
Cilia that line our respiratory system help trap dust and other foreign particles, thereby preventing them from further entering our body and causing problems.
That is true because that’s where it’s mostly are
B. prokaryotes because they do not contain organelles or a nucleus. the following above in the question all are eukaryotic and contain organelles and a nucleus
