From Laboratory #4.
Lycopod fossil diagram 4. The conditions during the time of the carboniferous period supported lycopods that were 50 meters tall and 1 meter in diameter. The conditions also supported horsetails that were 15 to 18 meters tall. Today the descendants of those plants are much, much smaller. Which statement best describes the changes on the planet that may account for such change in these plants?

a. Conditions on earth have become much wetter.
b. Conditions on earth have become much drier.

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Last updated May 8, 1998.