Prokaryotic cells because they don't have a nuclei.
the factors are light intensity, carbon dioxide concentration and temperature. So you know which one is.
Answer:
Control group
Explanation:
A control group is<em> a group of individuals in an experiment where the independent variable being tested (the exposition to cigarette smoke in this case) can't influence the results.</em> This control group will be then compared to the experimental group (exposed to the smoke) to see the effect of the variable evaluated.
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