TASK DEFINITION: Given a statement and question, generate the answer to the question such that the answer is contained in the statement.
PROBLEM: statement: hornworts occupy niches in wet habitats, question: What occupy niches in wet habitats?

SOLUTION: hornworts

PROBLEM: statement: Complex systems are needed to carry out all the functions of organisms, question: What is needed to carry out all functions of organisms?

SOLUTION: Complex systems

PROBLEM: statement: MDMA alter neurotransmitters in the brain., question: What alters neurotransmitters in the brain?

SOLUTION:
MDMA