Logic of a solution: *Heterotrophs are living things that cannot make their own food. All animals are heterotrophic and obtain their food from plants. Animals obtain their food from plants and cannot make their own food.*
*(E)*
The original question: *What obtain their food from plants and cannot make their own food?
Options:
- (A) bacteria
- (B) Flowers
- (C) trees
- (D) lichen
- (E) animals
- (F) fungi
- (G) humans
- (H) grass*

Logic of a solution: *Mollusks are a major food source for other organisms, including humans. Interestingly, a squid is also a mollusk. Humans eat squid.*
*(H)*
The original question: *What do humans eat?
Options:
- (A) Kelp
- (B) sugar
- (C) legumes
- (D) food
- (E) Eyes
- (F) Coral
- (G) animals
- (H) Squid*

Logic of a solution: *Lymphocytes are the key cells involved in the immune response. B lymphocytes produce antibodies . The key cells involved in the immune response produce antibodies.*
*(H)*
The original question:
*The cells that produce antibodies are key in what system?
Options:
- (A) health
- (B) T cells
- (C) vision
- (D) humans
- (E) macrophages
- (F) B cells
- (G) disease
- (H) immune*