calcium compounds
organic salts
lipids
proteins
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Discussions (29)
d answer is wrong
in athropoda the chitin is strengthen by
protein....but athropods that stays in seas are
strengthen by calcium salts due to the high
content of calcium salt in water...
So the question says MANY athropods..and most
abondant of all athropods is insecta which lives on
land and there is no way there chitin is enhanced
by calcium....so d amswer is protein
go read your books
Chitin is strenghtened by calcium copounds like wise the skeleton in mammals. Calcium makes the bone rigid and healthy the same thing applies to exoskelectons covered with chitinous substance
Chitin is made up of polysaccharide and it is strengthened by calcium carbonate.
The ciliary muscles begin to sag with age leading to irregular transmission of light rays either in front of or behing the retina. Answer: Ciliary muscles!!
