Top Posters
Since Sunday
25
9
w
2
l
2
2
k
2
1
C
1
n
1
1
1
SlideshowReport

Wood first appeared in plants called progymnosperms.

Previous Previous Next Next
Description
(a) The progymnosperm Archaeopteris is among the most ancient trees on the planet and was the main constituent of the first forests. Fossils of this tree have been found in Devonian rocks across Canada. (b) A large frond from Archaeopteris halliana in the Escuminac Formation from Miguasha Provincial Park, Quebec.
Related Images
Explore
Post your homework questions and get free online help from our incredible volunteers
  111 People Browsing
 602 Signed Up Today
Your Opinion
What's your favorite funny biology word?
Votes: 48

Previous poll results: Who's your favorite biologist?