Preen gland is used during printing to a bird survive what do you think it does?

In the context of the neural impulse, which of the following is true about the depolarization of neuron membranes?

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back

Cells destroy body cells infected by a virus or bacteria.