Thread: Live Young?
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Old 06-15-03, 04:18 PM   #16 (permalink)
Zoe's Avatar
Join Date: Mar-2002
Location: Ottawa
Age: 32
Posts: 3,288
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What makes us mammals?
- Precise tooth occlusions, and molars that fit together perfectly.
- three middle ear bones
- 2 sets of teeth
- hair
- mammals produce milk (i believe even egg layers do)
- body heat

Samba - there are 3 mammals that lay eggs that I know of, the Platypus and two species of echidna
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