How did agriculture build civilizations?

Can someone give me the answers to this?

If blood is in short supply which blood type would be the most beneficial to have on hand if someone needed a blood transfusion?

The method by which new genes can be acquired by successive generations: multiple choice. is called mitosis is called meiosis is sexual reproduction is fertilization is by mutations has been imagined as evolution theory has never been documented by the scientific method is known as genetic recombination i have mutations and mitosis already, anybody know any more to add.