Classification of Animals
Question
Which of the following organisms lacks specific respiratory, excretory and digestive systems?
Easy
Solution
Leucosolenia (Porifera) lacks specific respiratory, excretory and digestive structures. It exhibits cellular level of organisation.
Echinus (Echinodermata) has a complete digestive system.
Apis (Arthropoda) has respiratory (trachea), excretory (Malpighian tubules) and digestive system.
Nereis (Annelida) has specific excretory organs (nephridia) and digestive system.
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