A molecule is formed when two or more atoms of an element chemically join together. If the types of atoms are different from each other, a compound is formed. Not all molecules are compounds, because some molecules, such as hydrogen gas or ozone, consist only of one element or type of atom.
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Negative feedback serves to reduce an excessive response and to keep a variable within the normal range.
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A. Individuals and families ended up polluting more than factories
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Pleiotropy
Explanation:
Pleiotropy is a condition that occurs when one gene affect several other phenotypic traits that are not related. The autosomal dominant allele of the genetic disease called blue sclera, is pleiotropic. It has the potential of causing also fragile bones and deafness which are entirely unrelated traits. Genetic mutation of a gene is the most likely explainable reason for the connection of these traits together.