[Q] What have humans have collected and grown for food for thousands of years?
Options:
- (A) sunlight
- (B) fungus
- (C) bread
- (D) salmon
- (E) fungi
- (F) dust
- (G) plants
- (H) edible
[A] Here's my solution: Humans have collected and grown mushrooms for food for thousands of years. Mushrooms are also fungi. Humans have collected and grown fungi for food for thousands of years. The answer is (E).

[Q] What increases the rate of metabolism in cells throughout the body?
Options:
- (A) Thyroxine
- (B) Smoking
- (C) fever
- (D) bioaerosols
- (E) acetic acid
- (F) sweating
- (G) Power plants
- (H) heat produced
[A] Here's my solution: Thyroid hormones increase the rate of metabolism in cells throughout the body. Thyroxine, a thyroid hormone, is an aryl iodide. Thyroxine increase the rate of metabolism in cells throughout the body. The answer is (A).

[Q] What is the process of breaking down food into nutrients?
Options:
- (A) recycling
- (B) food processing
- (C) digestion
- (D) bacteria
- (E) eating
- (F) hydration
- (G) Dehydration
- (H) blender
[A] Here's my solution: Digestion is the process of breaking down food into components the body can absorb. Nutrients are absorbed by the intestines and if the walls are coated, fewer nutrients are absorbed. Digestion is the process of breaking down food into nutrients. The answer is (C).

[Q] Lobsters have special structures for:
Options:
- (A) excretion
- (B) Cooking
- (C) produce light
- (D) staying warm
- (E) butter
- (F) Maine
- (G) layers of fat
- (H) tastiness
[A]
Here's my solution: Some arthropods have special excretory structures. An ant and a lobster are both arthropods. Lobsters have special excretory structures. The answer is (A).