Area of low pressure where air masses meet and rise

Hemoglobin is the compound in red blood cells that carries oxygen to the body. the distribution of hemoglobin in women in g/dl of blood is approximately normally distributed with mean 14 and standard deviation 1. too little hemoglobin, and you're anemic. 2. too much, and (unless you live at high altitudes), you can have other problems.

In the context of the neural impulse, which of the following is true about the depolarization of neuron membranes?

In what for do plants utilize nitrogen? why do they need nitrogen?