Failing to accurately cite even a single source "<span>a. can result in accusations of plagiarism" since even if this is not your intention, it is very hard to prove it when being examined. </span>
The answer is the last one :)
Answer:
All mammalian has a bone structure that consists of a skull with a brain inside and a spine with a spinal cord inside.
All mammalians have three little bones into the middle ear to transmit sound.
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All mammals have a dentary joint that joins the skull with the lower jaw and most of them have have heterodont teeth.
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Explanation: