When does genetic mutation occur

A mutation is a change that occurs when our DNA sequence either due to a mistake when the DNA was copied or as a result of environmental factors such as UV light and smoking

So basically they happen when the dna is being replicated but a mistake occurs and isn’t corrected quickly xoxo

Hold on to his or her beliefs even if there is no evidence for those beliefs.

Ithink option a is correct because you cannot donate a different blood group than yours because it won't match.option a says betsy can donate to mark. they have the same blood group so donation can happen.