The genetic combination of their parents.
Increasing genetic variation and the environmental effects on that variation form the basis for natural selection. Natural selection is a theory that states that those individuals who are best adapted to live in an area will survive and reproduce. I hope my answer has come to your help. God bless and have a nice day ahead!
Answer:
It has special items in the substance that are specialized for whitening and preventing things such as cavities.
Explanation:
I’m not 100% sure but I think it’s 8
