When did seaweed appear? the first land organism?

Question

im doing a time line in science class (7thgrade) and im having a hard time finding when seaweed appeared on the earth. and also im trying to find out what the first land oranism was and when it appered too. if you know the answers tell me. thanks :]

Answer 1

Here some sites with information:

General info:

http://en.wikipedia.org/wiki/Evolutionar...

Geologic timetable:

http://www.plantapalm.com/Vce/evolution/...

Here you find a chapter

EARTH HISTORY AND ALGAL EVOLUTION

http://aob.oxfordjournals.org/cgi/conten...

The oldest life on land:

http://nai.arc.nasa.gov/news_stories/new...

The colonization of land:

http://www.mansfield.ohio-state.edu/~sab...

THE  EARLIEST LAND PLANTS:

http://www.uni-muenster.de/GeoPalaeontol...

Plant Evolution: Adaptation or Historical Accident

http://nbsp.sonoma.edu/resources/teacher...

Answer 2

the first land "oranism" seaweed appeared a long time ago.