(Q).
Q: What are the blood vessels that carry blood toward the heart and tend to have thinner walls? Choices: - capillaries - glands - clots - veins A:
(A).
veins

(Q).
Q: What elements do mafic minerals typically include? Choices: - iodine and magnesium - sodium and magnesium - xerophyte and magnesium - iron and magnesium A:
(A).
iron and magnesium

(Q).
Q: What is the name of a reactant in an enzymatic reaction? Choices: - membrane - Scar - tissues - substrate A:
(A).
substrate