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Which atmospheric layer has the greatest air pressure? o mesosphere o thermosphere o stratosphere o troposphere​

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for each student . There are 18 students in his class Part A Round each fac
Name two types of cells that divide rapidly
I don't understand this :( pls help
The ΔPQR is right-angled at P, and PN is an altitude. If QN = 12 in and NR = 6 in, find PN, PQ, PR.