What do crustaceans use for respiration?

book lungs

gills

tracheal tubes

diffusion

What is a traditional chinese touch therapy involving finger pressure applied to specific areas of the body to restore the flow of qi.

The picture represents a structure of the respiratory system. which is the function of this structure? to bring air into the body to exchange oxygen with carbon dioxide to carry air to the lungs to release oxygen from the body

Which is an example of a vestigial structure? a. tail of a monkey b. fin of a fish c. flower of a plant d. tailbone of a human