Which substance has a natural pH? a. distilled water
b. milk
c. groundwater
d. Rainwater

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food? viruses can use energy in living cells that they infect. viruses can replicate inside a host that they infect. viruses can cause contagious illnesses in host cells. viruses integrate their rna or dna into infected cells.

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

Talking listening and reacting non verbally are all part of communicating