Simple | |
| heart. Air Bladder. Brain. | |
-------------+----------------------------+---------------+--------------
Amphibian. | Legs. Lungs. Cerebrum | | Muscles.
| increases from this | |
| form on. | |
-------------+----------------------------+---------------+--------------
Reptile. | Double heart. | | Muscles and
| | | appendages.
-------------+----------------------------+---------------+--------------
Lower | Constant high temperature | | Muscles and
Placental | Placenta. | Muscle. | appendages.
Mammals. | | |
-------------+----------------------------+ +--------------
Ape. | Erect posture. Hand. Large | | Brain.
| cerebrum. | |
| | |
| | |
-------------+----------------------------+---------------+--------------
Man. | Very large cerebrum.
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