What comprises an arthropod's exoskeleton?
a. Keratin
b. Spicules
c. Chitin
d. Bone
ANS: C
An exoskeleton is a strong yet lightweight external covering. It provides support and protection to
arthropods. Chitin is a nitrogen-rich carbohydrate that is strengthened by calcium carbonate.
Information can be found in the section Advanced Invertebrates Have Complex Bodies and Internal
Systems.
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Concepción, Bolivia
Latitude:_______ Longitude:__________
Elevation:______m_______ft
Population:_______
Avg. Annual Temperature (°C, °F):_______
Annual Temp. Range (°C, °F):_______
When a tornado is approaching from the southwest, its strongest winds are on its ____________________ side
Fill in the blank with correct word.
Which of the following is true of the Earth's coastlines?
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Indicate whether this statement is true or false.