In brain chemistry, synapses are very important. Synapses have a number of different forms but have two basic varieties:. excitatory and inhibitory. Excitatory synapses make it more likely that a neuron will send its message to other neurons, whereas inhibitory synapses make it less likely that a neuron will send its message.
This is because of natural selection; since polar bears live in a rough environment, natural selection gives them more fur, more muscle, and can go longer without food
True. you can know the age by the radiation.
Poly means many. Mono means one. So the answer is
C
