Can someone help me do this? I’ve been feeling sick so I missed a lot of things and I’ll have to study this for a test tomorrow. Please help if you could! :)

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.

When does dna replication(make a copy of itself)?

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion