Answer:
Chronic obstructive pulmonary disease
Explanation:
I'm not 100% sure of what you're asking here but the main term for COPD is Chronic obstructive pulmonary disease. COPD is a long-term lung disease, which makes breathing especially difficult. I hope this helps:)
They use tools to help take precise measurements, carry out experiments, and make observations.
Skeleton is what the connective tissue uses to stay part of the body. Without the skeletal system we wouldn't be able to move our muscles.