Sclera

There are three layers in the back of the eye: the retina, the choroid (which absorbs extra light), and the sclera. Thus, e is the choroid, and f is the sclera. Yes, your answer for the second question is correct.

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... (>7 vs. 5-6 for zebrata). So the type you have been calling alfredschmidti (which are significantly *larger* than zebrata, and have black sclera) are NOT alfredschmidti as described by Köhler (1997). It is possible that this larger type is a third distinct subspecies. But I don't know ...

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... cells do permit gas diffusion to a point. This is why painting someone's body entirely in paint is a really bad idea. As for the eye, well the sclera is a thick layer of protein (isnt it?) so its not cells that are obstructing gas.

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Google surely is a good source...i think your questions would take only a minute to get their answers via google! But sclera is made of collagen and elastic fibers...the rest help yourself !

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This is partially related to human physiology, and partially not. My questions are: What is the main substance that makes up the sclera? Are there any other animals with visible sclera? Thanks :) Matt Kneale

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