Answer:
Up and down
Explanation:
In the process of diffusion, a substance tends to move from an area of high concentration to an area of low concentration until its concentration becomes equal throughout a space.
Answer: A neutron is actually a subatomic particle that can be found in the nucleus of every atom except that of simple hydrogen and... I wasn't sure about the three parts for a neutron but for an atom is : protons, neutron, and electrons.
Explanation:
Stimulus stimulate the sodium ion voltage gated channel to open in the axon. This allow many Na ion to enter the axon and causes depolarisation as the pd in the axon getting less negative charge (from -70mV to -50mV).
I believe the universe is 13.8 billion years old. Possibly longer, or possibly shorter. Correct me if I'm wrong.