TASK DEFINITION: Given a scientific passage and an answer, generate a question for the given answer.
PROBLEM: Passage: Cynodonts probably gave rise to mammals about 200 million years ago. However, they are not considered to be mammals themselves. In fact, competition with early mammals may have led to their extinction. They went extinct sometime during the Jurassic or Cretaceous Period. Answer: mammals

SOLUTION: Competition with what emerging animal group may have led to extinction of cynodonts about 200 million years ago?

PROBLEM: Passage: For example, remember that for the height gene in pea plants there are two possible factors. These factors are alleles. There is a dominant allele for tallness (T) and a recessive allele for shortness (t) . Answer: alleles

SOLUTION: What factors determine the effect of a gene?

PROBLEM: Passage: Identify evidence for electroweak unification. The quarks in a particle are confined, meaning individual quarks cannot be directly observed. Are gluons confined as well? Explain. Answer: directly observed

SOLUTION:
The quarks in a particle are confined, meaning individual quarks cannot be what?