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53 N. Macdonald
Mesa, AZ 85201
(One block north of Main Street in downtown Mesa.
Take US 60 or 202 to Country Club Drive, go to Main
Street, and proceed one-half mile east to
Macdonald) -
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Map
Phone:
480-644-2230
E-mail |
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Walk Through Time (cont'd)
Origins of Life
Life originated on earth nearly 4 billion years ago,
yet multicellular life, organisms composed of more
than one, differentiated cells, did not appear for
over 3 billion years. Thus most of the history of
life on this earth is little known.
Journey onto Land
The emergence of vertebrates onto land, and the
transition from fish to amphibian is well known.
Less appreciated is the emergence onto land of
plants and at least eleven other animal groups.
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