Ques and Ans: What conserve body heat with their hair or fur?
Options:
- (A) foxes
- (B) snakes
- (C) goats
- (D) whales
- (E) dogs
- (F) cats
- (G) humans
- (H) lizards
(A)
Logic chain: Mammals conserve body heat with their hair or fur. Mammals include rabbits, foxes and coyotes. Foxes conserve body heat with their hair or fur.

Ques and Ans: What tells a cell what to do?
Options:
- (A) breathe
- (B) alleles
- (C) Energy
- (D) voltage
- (E) fever
- (F) genes
- (G) nerves
- (H) state
(F)
Logic chain: Molecules of DNA are encoded with instructions that tell cells what to do. Genes are parts of DNA molecules. Genes are instructions that tell cells what to do.

Ques and Ans: Where is force on the vessel walls highest?
Options:
- (A) arteries
- (B) feet
- (C) resistance
- (D) tibial vein
- (E) strong
- (F) capillaries
- (G) femoral vein
- (H) Summer
(A)
Logic chain: Blood pressure is highest in arteries and lowest in veins. What is Blood Pressure Blood pressure is the pressure on the blood vessel walls. Force on the vessel walls is highest in arteries and lowest in veins.

Ques and Ans: What must a chemical reaction overcome before starting?
Options:
- (A) PV=nRT
- (B) heat or cold
- (C) reactants
- (D) energy barrier
- (E) Dehydration
- (F) harmful substances
- (G) resistance
- (H) temperature
(D)
Logic chain:
All chemical reactions require activation energy to get started. Activation energy is required to overcome the energy barrier. All chemical reactions must first overcome the energy barrier.