Molten rock rises in earth's mantle and then sinks back toward the core in a circular pattern, this method of heat transfer is known as..
a) conduction
b) vibration
c)radiation
d) convection

Assume as what happens in a pot of water as it get heats.. hot becomes less dense, rises and cools, becoming more dense then sinks- that's called  CONVECTION
So D- is the right answer

Neurotransmitters are messengers responsible for communication between neurons. they are released from synaptic vesicles and are received by receptors.  the communication is referred to as neurotransmission. the following statement is true about neurotransmitters: a. they're stored in synaptic vesicles in the axon.