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How many of the following are amphibian characters?
(a) Presence of tympanum
(b) Absence of scales
(c) Presence of moist skin
(d) Presence of 2 chambered heart
(e) Indirect development
(f) Oviparity

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answer is B.

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Detailed Solution

The following are the characters of class Amphibia;

The amphibian skin is moist and is without scales.
A tympanum represents the ear.
They are oviparous and development is indirect.
Heart is three-chambered with an two atria and one ventricle.

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