How are musical instruments grouped?

by the wavelengths they produce

by how they produce pitch

by what they are made of

by their frequency

if the other one is wrong than i can help a little i took the test and tried what they are made of and that is wrong

answer: glucose is broken down

explanation:

cellular respiration is a three stage process your body undergoes to produce atp. the first of these stages is called glycolysis.

c-reactive protein (crp) is an acute phase protein belonging to pentraxin family of proteins, whose levels increases 1000-fold or more in concentration in blood during the occurrence of an injury, inflammation or tissue death.