Question

which is a symptom of cystic fibrosis?
lack of ability to strengthen muscles
digesting food too quickly
thick layer of mucus that can block airways

Explanation:

Cystic fibrosis is a genetic disorder that affects the lungs and digestive system. One of its key symptoms is the production of thick, sticky mucus. This mucus can build up in the airways, making it difficult to breathe. The other options are not typical symptoms of cystic fibrosis. Lack of ability to strengthen muscles is more related to muscular disorders, and digesting food too quickly is not a common symptom of cystic fibrosis.

Answer:

thick layer of mucus that can block airways