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growth and development

356

This tiny creature is quite common in many parts of the world. Sometimes you will see one that is white on one end, and dark on the other. What does that mean?

376

The larval stage of this insect is much better known to most people than the adult. What is it?

391

Cotton is an ancient fiber which is used by people for many things. What is its original function for the cotton plant?

404

This is Oak Tree House at Mesa Verde National Park, built by Native Americans in the year 1250 A.D. They left no written records, and no verbal history survived, so how do we know so precisely when it was built?

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