... habitats on earth (Lattin, 1976). This 'plasticity', or variation in segment shape, size and function while the simple body plan of three tagmata remains constant, has enabled many specialised appendages and sensory organs to develop. The evolution of insect wings 250 million years before birds' wings was a great evolutionary leap in terms of the aerial niche being previously inaccessible for ... ...

• Word Count: 728
• Approx Pages: 3
• Has Bibliography
• Grade Level: Undergraduate

... an exoskeleton to protect their organs. They possess a complete digestive system as well as a closed circulatory system. Their nervous system is made of a brain and a nerve cord. Furthermore, they possess appendages designed for movement. Perhaps an explanation of their complexity and diversity stemmed from their sexual reproductive techniques. Evolutionarily speaking, sexual reproduction allows for more diversity and potential for advancement. We ... ...

• Word Count: 377
• Approx Pages: 2

... head bears the mouthparts, eyes, and antennae. The thorax is divided into three segments, each with a pair of jointed legs, and bears two pairs of wings. The abdomen has posterior appendages associated with reproduction (1). Insects breathe via a network of "air tubes" located along the sides of the body. The air tubes open to the outside of the body. Larvae laid in ... ...

• Word Count: 721
• Approx Pages: 3
• Has Bibliography
• Grade Level: High School