When you observe data that consistently increases or decreases in response to a variable, you are observing a trend.
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answer; ///(b) it is composed of four protein chains and four heme groups;

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )