Biology · ANIMAL KINGDOM

In Class Amphibia, what is the 'cloaca', and which physiological systems open into this common chamber?

1. A common chamber into which alimentary canal, urinary tract, and reproductive tract open
2. A sensory chamber where auditory, optic, and olfactory nerves converge
3. A respiratory cavity where gills, lungs, and skin open to exchange gases
4. An excretory vesicle where kidney tubules and heart auricles open directly