(Q).
Q: What are the ultimate source of genetic variation? Choices: - parasites - gravity - proteins - mutations A:
(A).
mutations

(Q).
Q: What scientist constructed a tree diagram, separating living organisms into three domains? Choices: - Gibbs - CT Fletcher - Mendel - carl woese A:
(A).
carl woese

(Q).
Q: Arteries carry oxygenated blood away from the heart, what carries un-oxygenated blood back to the heart? Choices: - glands - intestines - lungs - veins A:
(A).
veins