Q: The lighter photic zone and darker aphotic zone are determined by what? Choices: - water reflection - water shape - water density - water depth A:
water depth

Q: What type of behavior is frogs croaking or deer clashing antlers an example of? Choices: - instincts - learned behavior - mating - courtship A:
courtship

Q: Q: The main components of the circulatory system are the heart, blood vessels, and what else? Choices: - lungs - nerves - brain - blood A:
A: blood

Question: Q: What is the ability of an atom to emit, or give off, charged particles and energy from the nucleus? Choices: - magnetism - electrolysis - electromagnetism - radioactivity A:
Answer: radioactivity

*Question*
Q: A minority of people on earth use up most of the planet's what, including energy? Choices: - air - sand - water - resources A:
**Answer**
resources

(Question)
Q: Telescopes use which kind of lenses to enlarge images? Choices: - crystalline - spherical - concave - convex A:
(Answer)
convex