The water contains all the food and oxygen they need, and they circulate the water thru their pores. Also, I dont know if this helps, but they keep food inside their bodies and from going out their pores with their collar cells that acts as little whips.
Poriferans do not have distinct circulatory system. Instead water flow system support all these functions like circulatory, respiratory, excretory etc.
Sponges are animals and are heterotrophs- they need to take in nutrients and food for energy. The nutrients are carried by the water into the sponge.
The respiratory system is the system that handles breathing.
The Respiratory System
All sponges don't have respiratory organs. Instead, individual sponges breath for the sponge.
The trachea is the airway in the respiratory system.
no, they do not have a respiratory system
The respiratory system.
Respiratory system
how does the respiratory system work
1. Respiratory system 2. Cardiovascular system
The lungs are part of the respiratory system! they help the circulatory by giving oxygen, but they are just respiratory.