According to the most accepted source, which appeared first?trilobites (those are the round, bead-like fossils right?), the starfish, or those types of trees with the almost fish scale looking bark. (sorry, i don't know there names!)
.....Also, did the trilobites dissapear before the starfish came into existience?
Thanks!
2007-11-22 16:25:55 · 1 answers · asked by David D 1 in Science & Mathematics ➔ Earth Sciences & Geology
Trilobites (arthropods) and starfish (echinoderms) both evolved in the late pre-cambrian, about 500 to 600 million years ago, and both evolved rapidly during the cambrian life 'explosion'.
The tree you are thinking about is the Wollemi pine, related to the auraucarias, and these developed much later, in the triassic period, about 200 to 250 million years ago. There were probably no terrestrial plants during the cambrian, when the trilobites were king.
2007-11-23 00:12:46 · answer #1 · answered by AndrewG 7 · 0⤊ 0⤋