Cnidarians

Essay specific features

 

Issue:

Science

 

Written by:

Lydia M

 

Date added:

April 29, 2015

 

Level:

University

 

Grade:

A

 

No of pages / words:

6 / 1431

 

Was viewed:

7428 times

 

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Essay content:

The names Coelenterata and Coelentera were once applied to the group, but those names included the Ctenophores,comb jellies, and have been abandoned. Cnidarians are very evident in the fossil records, when they first appeared in the Precambrian era.The basic body shape of a cnidarian consists of a sac with a gastrovascular cavity, with a single opening that functions as both mouth and anus...
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Ithas radial symmetry, meaning that whatever way it is cut along its central axis, the resulting halves would always be mirror images of each other. Their rmovement is coordinated by a decentralized nerve net and simple receptor.There are four main classes of Cnidaria Class Anthozoa ,anemones, corals, etc...
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