Two types of genes play major roles in regulating the cell cycle: proto-oncogenes encourage cell division, while tumor-suppressor genes inhibit cell division. the balance between these two types of genes may be disrupted by naturally occurring or environmentally caused

this website is for anybody really not just for girls just saying, also while a lot of males are mean and you know there are the few who are kind and then there's the nice-guys but then theirs also guys like me who are shy we don't get out much because there are people like you who exist who would most likely punch a guy in the face so next time just think about things before you post them to a website where guys and girls can see your question.

d. changes in climate and historical records

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linnaeus is the father of taxonomy, which is the system of classifying and naming organisms. one of his contributions was the development of a hierarchical system of classification of nature. today, this system includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.