The correct answer is d. both excitation and inhibition.
There is a process which is called summation and it refers to the process that determines whether or not an action potential (on postsynaptic neuron) will be generated by the combined effects of excitatory and inhibitory signals (from the presynaptic neurons). Depending on the sum total of inputs, summation may or may not reach the threshold voltage to trigger an action potential (firing of postsynaptic potential).
Cellular respiration allows carbon to enter water, that is a process that allows cells to get energy from nutrients.
The answer is C. I hope I helped you. If you have any other questions labour biology a good source is quizlet.
The chemicals help the roots of the plants to grow
The other thing is a lot better health cause it the answer to ur question dummy
