TASK DEFINITION: In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
PROBLEM: Question: Knees and elbows are examples of what part of the skeletal system? Answer: joints

SOLUTION: Knees and elbows are examples of the joints of the skeletal system.

PROBLEM: Question: What are the sporophytes in ferns? Answer: leafy plants

SOLUTION: Leafy plants are the sporophytes in ferns.

PROBLEM: Question: What branch of science is based on the modern atomic theory, which states that all matter is composed of atoms? Answer: chemistry

SOLUTION:
Chemistry is based on the modern atomic theory, which states that all matter is composed of atoms.