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The ancestors of present-day insects were probably worm-like arthropods with a simple mouth opening near the front of a bilaterally symmetrical body. Over many eons of time, tissues and appendages near the mouth opening came to be adapted for gathering and manipulating bits of solid food. As insects evolved, they became more complex, expanded in range, and adapted to new food resources. The structure and function of their mouthparts changed right along with their evolving diet and life style. Examples of adaptive radiation can be found just about everywhere in the insect world think about variability in legs, wings, and antennae, for example. Entomologists pay close attention to mouthparts because their structure allows us to infer what type of food is consumed — plant or animal, solid or liquid, dead or alive.

Skip to primary navigation Skip to main content Skip to primary sidebar Skip to footer. Read Full Article. Feb 12, by Coach Corey Wayne. How my work turned a green haired man hating feminist back into the beautiful feminine woman that God…. Feb 10, by Coach Corey Wayne. How you can spot low quality women who use the friend zone to manipulate men with the promise…. How a mostly celibate, unhappily married church pastor became a ladies man and met his dream woman.

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Last Updated: November 17, References Approved. This article was co-authored by Monica Morris. With over 15 years of fitness training experience, Monica started her own physical training practice and gained her ACE Certification in Her workouts emphasize proper warm-ups, cool-downs, and stretching techniques. There are 16 references cited in this article, which can be found at the bottom of the page.