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It has a single layer of cell.
Lay a paper on a flat surface. With your hands on the surface, push two sides together until you make something that looks like a polyp. Voila! Something similar to a crosssection of a sponge. Think of the paper as cells in a single line.
What else can I help you with?
Necessary features are sponges or cnidarians lacking in order to have a more mobile lifestyle?
Sponges lack muscle cells for movement, while cnidarians lack a skeletal structure for support and protection. Without these features, these organisms are limited in their ability to achieve a more mobile lifestyle compared to animals with more specialized adaptations.
What do sponges lack that make them more primitive and simpler?
Just finshed it on a test. Sponges lack a digestive track, symmertical plan, and nerce cells.
Are the three phyla of worms more closely related to complex animals or to sponges and cnidarians?
Ban'n chen, al fe research.
What is a primitive animal?
A primitive animal is a type of organism that is considered to be simple in structure and function compared to more complex organisms. These animals often exhibit features that are similar to ancestral forms, reflecting an earlier stage of evolution. Examples of primitive animals include sponges and jellyfish.
How are cnidarians more advanced then jellyfish?
Sponges are less complex because they are just made of individual cells. There is no level of organization past cells in sponges. Cnidarians, on the other hand, have tissues, a higher level of organization. Tissues allow for some forms, like box jelly fish, to have eyes (this is just one of many advantages of tissues). Cnidarians' level of organization stops there though, they have no organs (heart, brain, etc.).
How does digestion in cnidarians differ from digestion in sponges?
Digestion in cnidarians occurs through a gastrovascular cavity where food is captured using specialized cells called nematocysts, and partially digested within this central cavity. In contrast, sponges lack a digestive cavity and instead filter feed by drawing water through their porous bodies, trapping food particles with specialized cells called choanocytes. This means that cnidarians can digest food more actively and internally, while sponges rely on external filtering and cellular uptake for nourishment.
Why are pinocoderm and choanoderm in sponges not considered as tissues?
Pinacoderm and choanoderm in sponges are not considered true tissues because they lack the level of organization and specialization found in true tissues. The pinacoderm serves as a protective outer layer, while the choanoderm consists of flagellated cells that aid in water circulation and feeding, but both layers are not composed of tightly bound cells with defined functions. Instead, they retain a more simple, cellular organization characteristic of the primitive body plan of sponges, which do not have the complex tissue structures seen in more advanced animals.
What are 2 ways cnidarians are more advanced than jellyfish?
Jellyfish are cnidarians.
What is the comparative form of the word primitive?
The comparative form of "primitive" is "more primitive."
What group do cnidarians belong to?
Cnidarians are a phyla in the kingdom Animalia, and more specifically, the subkingdom Eumetazoa.
Which system is more advanced in cnidarians than in porifera?
The nervous system. Cnidarians have a neural net, but porifera do not.
Are porifera diploblastic or triploblastic?
Porifera, commonly known as sponges, are neither diploblastic nor triploblastic; they are considered to be a more primitive group of animals that lack true tissues. Instead of having distinct germ layers like diploblastic and triploblastic organisms, sponges have a simple body structure with specialized cells organized into a loose aggregation. They possess a unique cellular organization that allows them to filter feed and perform basic functions without the complexities of tissue layers seen in more advanced animals.
