Q: The nuclei of radioisotopes are unstable, so they constantly decay and emit what? A:

OPTIONS:
- moisture
- acid
- chemicals
- radiation

Answer: radiation

Q: What is the health-threatening smoke exhaled by a cigarette smoker or released from tobacco products? A:

OPTIONS:
- secondary smoke
- contamination smoke
- primary smoke
- secondhand smoke

Answer: secondhand smoke

Q: What type of muscle is found in the walls of other internal organs such as the stomach? A:

OPTIONS:
- Fiber Muscle
- inorganic muscle
- Tube Muscle
- smooth muscle

Answer: smooth muscle

Q: What is defined as a group of living and nonliving things and their environment? A:

OPTIONS:
- habitat
- degradation
- degradation
- ecosystem

Answer:
ecosystem