Rubrics for Lesson
The conquest of the land presented difficult problems
for the earth's animals to solve. The animals on your planet
will have to solve some of these problems as well.
The science fiction writer Isaac Asimov suggested that life
might never have appeared on earth's land without the presence
of the moon. The moon causes the tides, and tides provided
earth's shores with inter-tidal zones. Twice a day the sea draws
back, leaving wet sand and tide pools behind. Twice a day the
high tide returns, reliably flooding the inter-tidal zone again.
In this land of contrasting wet and dry conditions the plants
began to learn to deal with air and sunlight. Once plants had
begun to conquer the land, animals followed. However, the conquest
of the land was not without its problems.
Let's look at some problems and solutions.
Dealing with Exposure
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