18. Substances change states when they move between solid, liquid, and gas forms. When a substance changes from one state of matter to another, it has undergone
A. a reduction in mass.
B. an increase in mass.
C. a chemical change.
D. a physical change.

hi, natural selection of the peppered moth during the industrial revolution in 19th-century england is an example of an outlier in the study of evolution. during this time, pollution from factories filled the forests, coating trees in a layer of soot—turning white trees black

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gokuson

the sphincter muscles at the end of the digestive tract is the anus.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

you should wear a lead protective shield when having teeth x-rays

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-lavira : )