How are pressure measurements related to weather prediction?
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a. low, but increasing, pressure indicates stormy weather.
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b. stable pressure indicates stormy weather.
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c. decreasing pressure indicates stormy weather.
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d. high pressure indicates stormy weather.

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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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.

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