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BC: Enter the world of Wonderful Invertebrates and learn thing you never know about this enriched class.

1: The Wonderful of Invertebrates By: John Dcruz, Christopher Pocchia, Adam Majmudar

2: Part 1- Description / General Information

3: Invertebrates are animals with no backbone. They were the first animals to evolve about 650 million years ago. They take up 90% of all animal species on Earth. They include the world's highest jumper relative to its height (the spittle bug), the world's best weightlifter relative to its weight (the rhinoceros beetle) , and the fastest runner relative to its length (the American cockroach). Under them they have six classes (jellies, worms, arthropods, insects, mollusks, and starfish).

4: Part 2 – Structural and Adaptation Characteristics | Some invertebrates have adaptable exoskeletons so they can branch out and survive in different habitats. Most invertebrates are small because exoskeletons are heavy and if they were large it would be like creating a plate of steel. Invertebrates have either a complete or an incomplete digestive system.

5: Invertebrates have a hydrostatic skeleton which is used to change an organism's shape and making movement. It does this by pressuring fluid on surrounding muscles. It uses its coelom, a cavity filled with fluid that is surrounded by all the body's muscles Spiders have 4-8 eyes because most arachnids do not have necks to rotate their heads so they need eyes in all directions. Starfish and other sea stars us a hydraulic system to operate their arms.

6: Part 3- Habitats | Some invertebrates can live in a variety of habitats due to their adaptable exoskeleton. Here are a few examples: freshwater, saltwater, gardens, caves, dead wood, ground holes, and hay. Many also like dry damp habitats. Creatures like worms, can live underground or in human bodies.

7: Part 4- Feeding and Reproduction Characteristics | Most invertebrates reproduce sexually. Some reproduce asexually using fission or budding. Fission is when one animal splits into two parts. Each part then grows the missing part back henceforth there are two organisms. Budding is when an invertebrate grows a small bud. The bud is attached until it is fully developed. Then the bud separates from the invertebrate. Some invertebrates have an open digestive system which uses one opening for the mouth anus. Others have a closed digestive system using two openings for excreting solid wastes and eating food. Some starfish eat mollusks, sponges, and plankton.

8: Part 5- Sources |


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