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Across 1. The maximum volume of air that we can inhale and exhale during forced breathing is called _____. 5. An external skeleton that protects the animal and provides points of attachment for the muscles that move the appendages is called ______. 7. Jawed vertebrates that have limbs and feet that can support their weight on land are defined today as _____. 8. The study of human origins and evolution is called _____. 9. This returns excess body fluid to the circulatory system and functions as part of the immune system. 10. _____ is an iron-containing pigment that turns red when bound with O2.

Down 2. Undigested materials are expelled through the_____. 3. This protects against mechanical injury, infection, excessive heat or cold, and drying out. 4. A larva undergoes a major change of body form, called ______. 6. The rate of energy consumption by he body is called _____.