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

(Q).
Q: What is the respiratory pigment of almost every vertebrate? Choices: - insulin - plasma - iron - hemoglobin A:
(A).
hemoglobin

(Q).
Q: What is a common chemical substance on planet earth? Choices: - oxygen - nitrogen - hydrogen - water A:
(A).
water