In snails, the hard calcareous shells are secreted by the...
In snails, the hard calcareous shells are secreted by the
radula
ctenidium
pneumostome
mantle
Correct answer is D
No explanation has been provided for this answer.
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The tissue that carries organic food from its site of production to all other parts of the plan...
The use and disuse of body parts and the inheritance of acquired traits were used to explain ...