Q: What according to scientists is the major cause of depression? Choices: - low thyroid levels - high fat diets - high serotonin levels - low serotonin levels A:
low serotonin levels

Q: Which hormone helps cells absorb sugar from the blood? Choices: - estrogen - cortisol - adrenaline - insulin A:
insulin

Q: What is the primary component of steel alloys? Choices: - carbon - titanium - alluminum - iron A:
iron

Q: What are plants called that grow where you don't want them? Choices: - grasses - shrubs - reeds - weeds A:
weeds