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What type of animals have no body cavity?
Lower phyla in the animal kingdom such as Cnidarians, Porifera, and Ctenophora.
What characteristics gives cnidarians their name?
The characteristic that gives cnidarians their name is: cnidarian means "nettle" and nettles are plants that release stinging barbs into the skin. All cnidarians have stinging cell's. Cnidarians have complex tissues, a gut for digesting food, and a nervous system.
Which group of animals has tissues but no organs?
It is Phylum Porifera. The porifierans are multicellular organisms but don't have tissues or orgrans. Example: Scypha, Leucosolenia, Euplectella etc.,
What does the presence of only two tissue layers make cnidarians?
The presence of only two tissue layers in cnidarians makes them diploblastic, meaning they have an outer ectoderm and inner endoderm. These simple body plans lack organs and complex systems found in higher animals.
Which phylum contains the simplest animals?
The phylum Porifera contains the simplest animals, known as sponges. Sponges lack tissues and organs, and their body structure is very basic compared to other animal phyla.
Do Cnidarians have radial symmetry and tissues to carry out body functions?
Yes. They are are the first phylum to display cell organization into tissues and the second to desplay radial symmetry.
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.).
What phyla of animals have no tissue layers?
The phylum Porifera (sponges) is an example of animals that have no true tissue layers. They are considered the simplest multicellular animals and lack organized tissues.
What are the main characteristics of sponges cnidarians and worms?
Sponges are invertebrate animals that usually have no body symmetry and never have tissues or organs. Cnidarians use stinging cells to capture food and defend themselves. Flatworms are flat and as soft as jelly. Unlike cnidarians or flatworms, roundworms have a digestive system that is like a tube, open at both ends. Earthworms and other segmented worms have bodies made up of many linked sections called segments.
Are animalia unicellular or multicellular?
A sea star is multicellular.
Consumers that feed on tissues of dead animals?
consumers that deed on the tissues of dead animals
How are cnidarians important to evolution?
Cnidarians are important to evolution as they are one of the earliest groups of animals to have evolved specialized tissues, such as nerve cells and muscles. This laid the foundation for the development of more complex animal forms. Additionally, their evolutionary success in diverse habitats demonstrates their adaptability and resilience, contributing to the overall diversity of life on Earth.
