Which of the Following Is Not a Characteristic of Amphibians

question 78

Multiple Choice

Which of the following is not a characteristic of amphibians?

• A) They have a three-chambered heart.
• B) They are ectothermic.
• C) They have a cartilaginous skeleton.
• D) They do not have an amnion.
• E) They have vertebrae.

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Definitions:

(2S,4R)-4-ethylheptane-2-thiol

A chiral organic compound characterized by a specific three-dimensional configuration, including an ethyl and a thiol group on a heptane backbone.

(2R,4S)-4-ethylheptane-2-thiol

A specific stereoisomer of a compound featuring an ethyl group and a thiol group attached to a heptane chain.

(R)-3-methylpent-1-ene

A specific optical isomer of an organic compound with a branched five-carbon chain, featuring a double bond at the first carbon and a methyl group at the third position.

Reagents

Chemicals or ingredients introduced into a system to initiate a chemical reaction or to check for the presence of a reaction.