(Q).
Q: Which is the lightest of the widely used structural metals? Choices: - Metal - calcium - potassium - magnesium A:
(A).
magnesium

(Q).
Q: What is idefined as the mass of a substance divided by its volume? Choices: - weight - height - length - density A:
(A).
density

(Q).
Q: Producing sperm and secreting testosterone are the main functions of what system? Choices: - pollination - endocrine system - female reproductive system - male reproductive system A:
(A).
male reproductive system