Q: What happens when muscular walls of arteries and veins contract?
Options:
- (A) connection
- (B) It expands
- (C) Dehydration
- (D) construction
- (E) forces
- (F) massive damage
- (G) constriction
- (H) contraction
A: So, my chain of thought: Constriction occurs when the muscular walls of blood vessels contract. Arteries and veins are blood vessels. Constriction happens when the muscular walls of arteries and veins contract. The answer is (G).

Q: Cell division in what is more complex than cell division in prokaryotes?
Options:
- (A) bacteria
- (B) archaea
- (C) animals
- (D) SO2
- (E) fungi
- (F) plants
- (G) complex
- (H) E. coli
A: So, my chain of thought: Cell division is more complex in eukaryotes than prokaryotes. All plants are eukaryotes. Cell division is more complex in plants than prokaryotes. The answer is (F).

Q: What is the reason beak variation came about in birds?
Options:
- (A) By wind and rain
- (B) Attracting mates
- (C) It helps them survive
- (D) the Earth being tilted
- (E) Competing species evolving
- (F) it keeps an organism warm
- (G) To assist in flying
- (H) Warding off predators
A:
So, my chain of thought: Specialization occurs when competing species evolve different adaptations. Beaks show a lot of variation and specialization for different functions. Beak variation came about because of competing species evolving different adaptations. The answer is (E).