Exoskeletons - PowerPoint PPT Presentation

Phylum Arthropoda

Phylum Arthropoda. The largest animal phylum- 1 million species of crabs, shrimp, spiders, scorpions and insects make up this phylum Have jointed appendages; segmented bodies Exoskeletons made of chitin Molt; have heads with many sensory organs. Bilateral

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BIG BUGS

BIG BUGS . By john ranelli. Hypothesis . Modern beetles are must smaller than prehistoric beetles because reduced atmospheric oxygen has caused the beetle’s trachea, thus overall body size , to have a smaller growth capacity. What is an exoskeleton ?.

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