Give two examples of trait produced by mutations that help an organism survive?

Although the two theories differ on the evolutionary path of dinosaurs, they agree that

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

Twin boys have girlfriends one of the couples have a baby would the dna of the lil baby be the same as the couples dna bc the boys are identical twins