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.
Last Updated: November 3, References. This article was medically reviewed by Lacy Windham, MD. This article has been viewed , times. Disposing of a condom is more involved than you think. Though there is only one good place to dispose of a condom, the act of disposal merits much thought.
Naomi Petersen Naomi. Petersen cwu. One fifth of the population is affected by disability, and laws protect their rights as individuals to have access. Central's accessibility studies program provides opportunities to learn about barriers that exclude people with disabilities.