Dictionary » R » Radially



Arranged or having parts arranged like rays developing uniformly around a central axis.

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Protostomes and Deuterostomes

... any exceptions.... flatworms are acoelomates. The reason they are classified so, however, is because they may have a distant ancestor that links radially symmetric animals with bilateral ones. They share similar ribosomal RNA. It is thought that evolution simplified their body plan as time progressed. ...

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by plasmodesmata11
Mon Feb 23, 2009 12:16 am
Forum: Zoology Discussion
Topic: Protostomes and Deuterostomes
Replies: 4
Views: 10747


... System of a starfish consists of ___. ectoneural, hiponeural and endoneural part. Each of them consists of neural ring (surrounding bowel) with radially organised neural stems. 10: A Starfish can reproduce ___. Sexually and vegetatively 11: At the end of each arm of the starfish there is a(n) ...

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by SU_reptile
Fri Dec 15, 2006 10:18 pm
Forum: Zoology Discussion
Replies: 8
Views: 10476


... muscle lies around the very edge of the pupil. In bright light, the sphincter contracts, causing the pupil to constrict. The dilator muscle runs radially through the iris, like spokes on a wheel. This muscle dilates the eye in dim lighting. The iris is flat and divides the front of the eye (anterior ...

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by Dr.Stein
Mon Dec 12, 2005 8:29 am
Forum: Human Biology
Topic: eye
Replies: 11
Views: 6424

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