Why is it important to supply an assortment of empty shells in the habitat?

What will be an ideal response?


Hermit crabs change shells before or after a molt (usually after), they have no shells of their own; they may fight over a shell.

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Agricultural Education was once called

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It is estimated that ____ of the wetlands of the United States have been destroyed for construction or for agricultural purposes

a. More than half c. About one-third b. Nearly all d. Less than one-quarter

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Which EU institution gained new powers as a result of the passage of the Lisbon Treaty on January 1, 2009?

a. the European Commission (EC) b. the EU presidency c. the European Central Bank (ECB) d. the European Union Parliament

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In Figure 39-34, when is the reversing valve energized: the heating cycle or the cooling cycle?

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