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A large sponge may serve as home to hundreds of invertebrates, including brittle
stars, shrimp, worms, and sometimes small fish. The sponge itself can function
perfectly well regardless of the presence of these guests, as its simple cells
Protected by its battery of spines, this echinoderm moves about slowly feeding on
algae and small invertebrates. In some areas sea urchins scrape away a scar in
the rock in which they reside. Some remain in the scar permanently, allowing ...
Within the holdfasts, numerous invertebrates, including brittle stars, crabs, sea
stars, and worms, find shelter from predators. Some will live out their lives here,
but others like the sea stars and crabs remain only while very young and small.
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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