Q: What is the main type of cell in the nervous system called? Choices: - sensory - conduction - axon - neuron A:
neuron

Q: What happens to energy when an atom gains an electron? Choices: - it is folded - it is used - it increases - it is released A:
it is released

Q: How many types of mechanical waves are there? Choices: - five - nine - one - three A:
three