HELP with homework for biology plz!!!!?

[bati]

i have two questions i can't find the answers to.
1) Based upon fossil evidence, what organisms were the first on Earth to perform photosynthesis.

2)Explain the significance of the Cambrian Explosion.



I will give best answers so THX

[yahp its ok..]

http://warrensburg.k12.mo.us/ew/ehissumm.html
http://en.wikipedia.org/wiki/Cambrian_explosion
try to get info from here..
hope i helped=)

[Isaac D]

1. planktons --- they're the first plant to do so,
2.The Cambrian explosion or Cambrian radiation was the seemingly rapid appearance of most major groups of complex animals around 530 million years ago, as evidenced by the fossil record. This was accompanied by a major diversification of other organisms. Before about 580 million years ago, most organisms were simple, composed of individual cells occasionally organised into colonies. In the following 70 million to 80 million years, the rate of evolution accelerated by an order of magnitude, and the diversity of life began to resemble today’s