Which one do you want answered
D is correct. Cool air sinks, which forces warm air to rise.
Convection is when warm material rises and cool material sinks
Hope it helps
Answer;
-Neurotransmitters.
One of the first key terms she memorizes is neurotransmitters because these are the chemicals via which neurons communicate with each other.
Explanation;
-Neurons communicate with each other via electrical events called 'action potentials' and chemical neurotransmitters. At the junction between two neurons (synapse), an action potential causes neuron A to release a chemical neurotransmitter.
-Neurons are connected to each other through synapses, sites where signals are transmitted in the form of chemical messengers.
Gene mutations that result in cancer often cause the cells to divide uncontrollably. When too many cells are made to quickly it develops into a tumor which usually leads to cancer.<span />
All living organisms are made up of cells
