Ques: More recently, the death rate has fallen because of the availability of more food and medical advances.  When the villagers are living longer, the food source is likely great or small?
Ans: great

Ques: When a person exercises regularly, and is fit, the heart undergoes certain long-term adaptations. The heart muscle gets stronger, and expels more blood with each contraction.  If Ben exercises daily, and Anna exercises only weekly, who has a stronger heart Ben or Anna?
Ans: Ben

Ques: The farther the object is stretched or compressed, the greater its elastic potential energy is.  Letting a stretched a rubber band become looser decreases or increases its elastic potential energy?
Ans: decreases

Ques: Smoking reduces the amount of oxygen available for diffusion at the lungs, so less oxygen gets absorbed and blood is oxygenated to a lesser degree.  Will is smoking a cigarette. This causes more or less oxygen to be available for diffusion in his lungs, so less oxygen will be absorbed into his blood?
Ans:
less