Nitrogen fixation
a. is the process where nitrogen is converted to a usable form
b. is accomplished by plants when they break down soil
c. occurs as a result of photosynthesis
d. none of the above

d.) circle motion requires a force to give it a centripetal acceleration.

intermolecular forces are the forces between molecules or particles.

there are two kinds of van der waals forces: weak london dispersion forces and stronger dipole-dipole forces.

in molecule of water there are dipole-dipole forces between negatively charged oxygen from one molecule of water and positively charger hydrogen of another molecule of water.

hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (h), covalently bound to a highly electronegative atom such as flourine (f), oxygen (o) and nitrogen (n) atoms.