The simplest animals, such as sponges (Porifera) and rotifera (Rotifera), do not require a circulatory system because diffusion allows for the proper exchange of water, nutrients, waste, and dissolved gas (figure). a).
Why does the sponge have no nervous system?
The sponge is one of the most primitive of all animals. They do not move and live by filtering the debris from the water. They don't have a brain, and for that matter, they don't have neurons, organs, or even tissues. 2009
Does the sponge have a heart?
In summary, sponges (or sponges) do not have a true circulatory system like most animals. There are no hearts, veins, arteries, and no blood on the sponge. .. Water is drawn into the sponge through the inner choanocytes, and the inner choanocytes take up water from the outer pores of the sponge.
Is there evidence of nervous or circulatory system in the sponge?
The sponge has no nervous system, digestive system, or circulatory system. Instead, most people rely on maintaining a constant stream of water through their bodies to get food and oxygen and get rid of waste products.
Does the sponge have a nervous system?
The sponge does not have a nervous system, digestive tract, or circulatory system. They have no muscles. Because sponges are so primitive, coral looks highly sophisticated and has been around for at least 600 million years.
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