In order<span> to simplify the </span>huge<span> amount of geological information, geologists have ... Fossils records have shown that life existed for about 3,800 million years, but complex life ... </span>begins<span> with the start of the</span>Cambrian period<span>, </span>544 million years ago<span>. ... An </span>era<span> of </span>geologic time<span> from the </span>beginning<span> of the Tertiary</span>period<span> to the present</span><span>.</span>
Which one are you trying to answer ?
