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How many life stages do cnidarians generally have?
Cnidarians have two cell layers with a jelly-like layer in between.
How are cnidarians less complex than annelids or mollusks?
Cnidarians include jellyfish and corals. Cnidarians are less complex than annelids or mollusks because the latter have gills with many layers of tissue.
What does the presence of only two tissue layers make cnidarians?
The presence of only two tissues layers makes cnidarians diploblastic. These tissues layers consist of an epidermis (outer layer) and a gastrodermis (inner gut layer). Mesoglea, a type of jelly-like substance is between these layers.
What are made up of two cell layers and have only one body opening?
Cnidarians.
What cnidarians produce asexually?
All Cnidarians can reproduce asexually through either budding, splitting down the center, and some can bot bud and split themselves. Some Cnidarians reproduce sexually as well, but not all.
Do cnidarians have an exoskeleton?
Yes; many cnidarians have an exoskeleton.
What is germ layers?
A germ layer, occasionally referred to as a germinal epithelium, is a group of cells, formed during animal embryogenesis. Germ layers are particularly pronounced in the vertebrates; however, all animals more complex than sponges (eumetazoans and agnotozoans) produce two or three primary tissue layers (sometimes called primary germ layers). Animals with radial symmetry, like cnidarians, produce two germ layers (the ectoderm and endoderm) making them diploblastic. Animals with bilateral symmetry produce a third layer between these two layers (appropriately called the mesoderm) making them triploblastic. Germ layers eventually give rise to all of an animal's tissues and organs through the process of organogenesis.
How many types of cnidarians are there in the world?
Cnidarians do not have legs. Many have stinging tentacles. The number of these varies by species.
Are cnidarians protostomes?
No, cnidarians are not protostomes. They are classified as diploblastic animals, meaning they have two germ layers during development (endoderm and ectoderm), whereas protostomes are triploblastic animals with three germ layers. Cnidarians are more closely related to animals like jellyfish, corals, and sea anemones.
How do cnidarians obtain O2?
Cnidarians (Jellyfish and relatives) have a body made of non-living mesoglea (which doesn't need oxygen) surrounded by 2, 1-cell thick, layers of epithelium, which obtain oxygen directly from the water.
What are the characteristics of cnidarians?
All cnidarians have on their tentacles stinging cells called nematocytes. They have no brains or a central nervous system. Another common feature is that they all can regenerate, letting them produce asexually (without the need for another partner) and to recover from injury.
Do cnidarians have sight?
Cnidarians do no possess eyes for sight, though many of them are able to sense light vs dark.
