What is a solar nebula

Describe the function of the endomembrane system? what organelles are involved?

The air that we breath is made mostly of which gaseous molecule

Point charges q1 = 51 µc and q2 = −27 µc are placed 1.0 m apart, with q2 on the right. what is the force (in n) on a third charge q3 = 19 µc placed midway between q1 and q2? (assume the positive direction is to the right. indicate the direction with the sign of your answer.)