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Essay

Crinoids

Essay specific features

 

Issue:

Science

 

Written by:

Ethel P

 

Date added:

August 11, 2015

 

Level:

University

 

Grade:

B

 

No of pages / words:

3 / 565

 

Was viewed:

3341 times

 

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Essay content:

All modern crinoids have evolved from this lineage. Crinoid bodies consist of three main parts: A calyx or aboral cup, the arms and the stem. The calyx contains the vital organs of the animal. It is small when compared to the total mass, most of which is devoted to food collection. A simple digestive system is located within the upper body...
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A simple digestive system is located within the upper body. The arms are composed of an articulated series of ossicles that are used in suspension feeding and respiration. Reproductive organs are also located in the arms as fertilisation takes place in open water during mass spawnings. The stem supports the animal and together with the roots and cirri serve as a means of attachment to the sea bed...
displayed 300 characters

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