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For hundreds of millions of years, waves have encountered the shallows of land
and have risen to break against countless beaches. The land, however, cannot
withstand the force of the water and the gradual but inevitable process of erosion
Biologists theorize that this event took place approximately 400 million years ago,
thus beginning colonization of the land. ♢ What evidence do you see in modern
crabs that makes them likely candidates as the first land animals? ♢ What might ...
Sea lions can support their weight on their front flippers and so are able to raise
themselves up on land and "walk." The rear flippers can move forward and
backward, contributing to the animals' ability to move successfully on land. The
seal is ...
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I purchased all three books in this set and taught a short course to a small group of high school kids. We had a great time with this course! We did 10 experiments and held very intense all-day ... Read full review