TASK DEFINITION: Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.
PROBLEM: Question: Differences in fitness among different members of a population can lead to what kind of selection? Answer: natural selection

SOLUTION: Natural selection occurs when there are differences in fitness among members of a population.

PROBLEM: Question: What do sharks use to secrete salt to assist in osmoregulation? Answer: rectal gland

SOLUTION: animals exposed to similar levels of urea. Sharks are cartilaginous fish with a rectal gland to secrete salt and assist in osmoregulation.

PROBLEM: Question: A boiler converts the chemical energy stored in fuel into what type of energy? Answer: thermal energy

SOLUTION:
Water is heated in a boiler that burns a fuel such as natural gas or heating oil. The boiler converts the chemical energy stored in the fuel to thermal energy.