Boyfriend and girlfriend friend

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

Mount saint helen the great lakes and death valley are physical features of the earth which scientific term describes these features

You have a poultry farm and a poultry-processing unit. which product can you make using the waste products from your processing unit?