Sponges have flagellated cells over the surface of their bodies, these are cells that have tails that wiggles. The collective effort of all these cells creates a water current through the many porous openings in the sponges body. It is a water based circulatory system.
The phylum Porifera was the first group of animals to be found but they don't have a special digestive system because they are a sponge, the sponge takes in food via the water that flows through the pores.
none
Perch have complete digestive systems
A gastrovascular cavity is a digestive sac with only a single opening. A complete digestive tract (otherwise known as an Alimentary canal) has two openings (a mouth and anus) between its digestive tubes unlike the gastrovascular cavity in which food is ingested and eliminated through the same opening (example would be hydra)
gastrula
What_is_the_posterior_opening_of_the_digestive_tract_in_a_fetal_pig
Sponges have a cavity lined with specialized cells that absorb the food that enters or is swept in by cilia. Not very complex.
oral cavity and stomach
It does actually become a body cavity, it becomes the digestive tract; the tube that passes through the body from mouth to anus.
Oral cavity, esophagus, stomach, small intestine, large intestine.
No, a gastrovascular cavity only has one opening. Only an alimentary canal features a mouth and anus.
This space is called coelom or body cavity .
No, the oral cavity is the first part of the digestive system.
Food does not go 'Inside' of your digestive system. It remains 'Outside' of the digestive system. So most of the digestion is extracellular. So from mouth to anus the entire digestive system is connected to the 'Exterior' and is not technically and immunologically 'Inside' your body.