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Q How can the endoskeleton of echinoderms be characterized in comparison to analogous structures present in vertebrates, arthropods and molluscs?
The echinoderm skeleton is internal that is, it is an endoskeleton. It is made of calcium carbonate called as calcareous.
Vertebrates also have internal skeleton made of cartilages and bones. Arthropods have an exterior carapace made of chitin, a chitinous exoskeleton a few molluscs present a calcareous shell that works as exoskeleton.
Describe a. the factors responsible for promoting lactation, and b. the mechanism responsible for the cessation of lactation when a mother weans her baby.
Composition - Culture Medium A standard plant tissue culture medium (Basal medium) contains all the essential macro elements (Carbon, hydrogen, oxygen nitrogen, phosphorus, su
is thare any excretory system found in echinoderms
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