What question did charles darwin attempt to answer

Which of these terms are associated with communication between neurons? chemical signals, electrical signals, synapse chemical signals, synapse, neurotransmitters synapse, electrical signals, chemical signals synapse, electrical signals, neurotransmitters

Feedback is given with little or no reservation 1.supportive 2.high-monitoring 3.positive 4.low-monitoring ?

What gpa will you get if you make all a's and 1 b?