Biology · ANIMAL KINGDOM
हिन्दीIn which of the following animal groups is the digestive system incomplete (having a single opening serving as both mouth and anus), and the circulatory system absent or of open type respectively?
Correct answer · Option 2
Platyhelminthes and Arthropoda
Explanation
Platyhelminthes have an incomplete digestive system with a single opening to the outside of the body. Arthropods possess an open type circulatory system where blood is pumped out of the heart into body cavities.