Q: What is the leading cause of lung cancer? Choices: - chewing tobacco - heredity - tuberculosis - tobacco smoke A:
tobacco smoke

Q: Sulfur can combine with oxygen to produce what? Choices: - sulfur bioxide - sulfur dioxide - sulfur oxide - sulfur trioxide A:
sulfur trioxide

Q: Q: The medieval catapult has a heavy ballast on one end and what on the other end? Choices: - fragment - pivot - propellant - projectile A:
A: projectile

Question: Q: What is the master gland of the endocrine system? Choices: - Thyroid - Hypothyroid - Thymus - pituitary gland A:
Answer: pituitary gland

*Question*
Q: What part of blood releases clotting factors? Choices: - hemoglobin - white blood cells - erythrocytes - platelets A:
**Answer**
platelets

(Question)
Q: What is usually necessary to develop cancer? Choices: - crucial genes mutations - massive genes mutations - novel genes mutations - multiple genes mutations A:
(Answer)
multiple genes mutations