The polar nuclei of the center cell
The answer is D its the right answer because on the moon there is not oxygen for it to reach that state
Functional and economically most important mineral in nutrition of layers
is calcium, primary because of egg production, i.e. forming of the egg shell.
As the sun heats the surface of the oceans, two layers of water result. These layers are separated by the Thermocline.
so your answer is thermocline.
Because gravity pulls towards the center of the earth evenly in all directions, giving earth a spherical shape.