Multiple cell types, including neurons and glia, can arise from the same precursor cells. because of this potential to give rise to many different types of tissue, these precursorcells are also called which of the following? choose the correct option. a) neuroblasts
b) newly generated neurons
c) daughter cells
d) neural stem cells

D) Neural stem cells

Explanation:

Multiple cell types, including neurons and glia,  have the capacity to arise from same precursor cells. Because of this potential these precursor cells are called Neural stem cells.

Neural stem cells are multi potent stem cells present in the adults central nervous system that can self renew themselves. They also give rise to  new neuron supporting cells called Glia cells.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

+15-35=-20

going in opposite directions