You didn't really provide any possible answers here. However, it's very easy to say that the responsible actors for impulse transmission across the synapses from one nervous cell to another nervous cell is what we call neurotransmitters. These are special molecules that can have different effects when binding onto the required receptor sites.
Many US Farmers have lost their family farms over the last 40 years because they could not compete with the big corporations
Hope this helps!
-Payshence
True that should be the answer
False! Climate change
The Earth used to be way colder than it is today