Answer:
Controls the movement of substances into and out of the cell.
Pulmonary ventilation, and carbonic acid-bicarbonate buffering system
I believe the answer is gills
Fish's use gills to breathe, so tadpoles should use gills too
hope this helps
(got the info from a documentary i watched a couple years ago)
Answer:D. Compound.
Explanation:
A compound is defined as a pure substance: formed when two or more elements chemically combine to form bonds between their atoms.