input with options: Fact 1: Brain cells die quickly if their oxygen supply is cut off.  Fact 2: Brain atrophy means the brain matter has shrunk, often because brain cells are dying or dead.  Given the two facts above, what causes brain atrophy?
output: lack of oxygen

input with options: Fact 1: Weathering means breaking down rocks from larger whole into smaller pieces by weather.  Fact 2: Most soil is made of weathered rocks.  Given the two facts above, what is soil made from?
output: Rocks breaking down

input with options: Fact 1: Fertilization of gametes produces a diploid zygote.  Fact 2: Sperm and egg nuclei combine to form the diploid zygotic nucleus 2.  Given the two facts above, sperm and egg nuclei combine to do what?
output: fertilize gametes

input with options: Fact 1: Aggression is behavior that is intended to cause harm or pain.  Fact 2: If it jumps, bites and growls, it is aggressive.  Given the two facts above, an animal jumps, bites and growls to cause what?
output: