Our _____ protects us from illness by neutralizing or destroying harmful viruses

Which one of the following would be an example of a secondary drive?

a) Feeling hunger pangs b) Shivering because you are cold when you step out of the shower c) Working to buy food d) Drinking from a water fountain when you are thirsty

The shape of a neuron varies, depending mainly on what?

a. Whether the individual is male or female b. The number of chromosomes in the neuron c. How recently the neuron produced an action potential d. The nature of the neuron's input and output