Organ System Level of Organisation

Q. A complete digestive system is where

1. all the digestive glands are present
2. both anus and mouth are present
3. digestion occurs in the cavity of the digestive tract
4. digestion occurs in the individual cells lining the digestive tract

Q. Animals having well-marked digestive cavity are included under

1. parazoa
2. enterozoa
3. mesozoa
4. protozoa