Why is the population so low in northern and western China? * 10 pc
There is an abundance of rainfall in this area.
There are too many resources for people to choose from.
There is very little rainfall and the temperatures can be extreme.
O The land is too fertile for people to grow crops.
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List the two type of transporst that the cell in orde to transport molecules acroos the membrane

What is the molar mass of potassium nitrate, kno3

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?