Which phrases describe an irregular galaxy?

Amutagen is 1: a living thing that has undergone a mutation. 2: an agent that causes a mutation in dna. 3: a mutation that has affected one gene. 4: a chemical that can poison living cells.

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

The model illustrates a process by which a substance is taken up by a cell