QUESTION 17 What is NOT a function of arthropod exoskeletons? Energy storage Pre

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QUESTION 17 What is NOT a function of arthropod exoskeletons? Energy storage Prevents dessication Resists mechanical loads Protection QUESTION 18 Spectra is made from polyethylene polystryrene polycarbonate polypropylene QUESTION 19 Approximately how much stronger is are young people's tendons and ligaments compared to old people? 5 times as strong 2 times as strong 1/2 the strength stays the same QUESTION 20 Biological elastomers are biological polymers. True o False QUESTION 21 Without an applied external electric field, no equilibrium current flow will exist. True False QUESTION 22 A diode can change direct current (DC) to alternating current (AC). True e False QUESTION 23 Semiconductors have a "forbidden band" or "gap" between filled and empty electron energy states that is much smaller than that of an insulator. True False QUESTION 24 An alternative formulation of Ohm's Law is voltageconductivityx electric field potential voltage - resistivity x electric field potential current density = resistivity x electric field potential current density = conductivity x electric field potential

Explanation / Answer

1. anthropod exoskeleton provides protection to animal's soft, inner organs and muscles from injury. It prevents dessication and also resists mechanical loads. thus the answer is energy storage.

2. Spectra is made from polyethylene. Spectra are lightweight high-strength oriented-strand gel spun through a spinneret.

3. 2 times as strong because Tendons and ligaments shorten and become less flexible with aging, so it is important to maintain flexibility with stretching exercises. Better flexibility means less stiffness, fewer injuries, and easier overall movement.

4. false

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