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Around 4.1 billion years ago, the first single celled life form appeared on Earth
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Cartilaginous fish do not contain any bones - their skeleton is made up of cartilage.
This question is unfortunately incomplete. However, the general skull features of <em>H</em><span><em>omo heidelbergensis </em></span>include large brow ridges, a broad, sloping forehead and a rear skull wall that is vertical rather than rounded or sloping.
Because then you get a infection
