You are given a short paragraph, a question and two choices to answer from. Choose the correct answer based on the paragraph and write the answer(not the key).

Q: Paragraph: Warm air is less dense than cool air, so it rises higher in the troposphere.
 Question: If Jim raises the temperature of the air inside his balloon, will his balloon rise higher into the air or sink towards the ground? 
 Choices: A)rise higher 
B)sink lower

A: rise higher
****
Q: Paragraph: The higher up a food chain that humans eat, the greater the levels of toxic metals they take in.
 Question: A human who eats an animal that is low on the food chain should take in _____ toxic metals. 
 Choices: A)more 
B)less

A: less
****
Q: Paragraph: As the nail grows, more cells are added at the nail bed.
 Question: Dana clipped her nails short, and waited for them to grow out again. When her nails reached a long length, Dana noted that the number of cells within them must have 
 Choices: A)decreased 
B)increased

A:
increased
****