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The main difference between haploid and diploid cells is the number of chromosome sets found in the nucleus. Diploid cells have two sets while haploid cells only contain one set.
The correct answer would be carcinogens. Carcinogens can disrupt cellular homeostasis and can even lead to uncontrolled cell division and form of cancers. These are substances that damages the cellular metabolic processes in the body. Carcinogens are found everywhere; it may be in our food, radiation or even some of the ingredients of the things we use daily.