TASK DEFINITION: Given a scientific question, generate a correct answer to it.
PROBLEM: Name the fever that is caused by a virus that has antigens similar to molecules in human heart tissues.

SOLUTION: rheumatic fever

PROBLEM: In contrast to mammals and birds, freshwater fishes produce large volumes of very dilute what?

SOLUTION: urine

PROBLEM: All of the living things in an area and the nonliving environment together make up what?

SOLUTION:
ecosystem