Pls help with all dew in 5

Ais a fluid-filled space between two neurons through which neurotransmitters travel. it is in this area where messages are transmitted chemically. a. terminal button b. synapse c. neuronal membrane d. synaptic vesicleits b, i just guessed it and it turned out to be right.

What angle should your knees not bend past when squatting? a. 30 degrees b. 45 degrees c. 90 degrees d. 120 degrees

Scientists believe that differences in cause hot, plastic-like rock in the asthenosphere to rise toward earth's surface. a. density c. weight b. magnetism d. composition select the best answer from the choices provided