Inverterbrates8

Invertebrates

** What is an Invertebrate? ** Invertebrates are the second most major group of organisms that live in and around streams and rivers, they do not have backbones, and are cold-blooded. > > Picture from []
 * Consists of: **
 *  I nsects ( flies and beetles )
 * Mollusks ( chitons, snails, bivalves, squids, and octopuses )
 * Worms
 * Crustaceans ( lobsters, shrimps, crabs, barnacles, and wood lice )

- All invertebrates have one thing in common, they do not have a skeleton. - Over 98% of the animal species in the world are Invertebrates. - Some Invertebrates have a hard outer shell, while others have a fluid-filled hydrostatic skeleton which allows the organism to move more differently and be more flexible for swimming, burrowing, etc.

The most common Invertebrates are:  **Protozoa ( Fungis )** Picture from []
 * Protozoa
 * Annelids
 * Echinoderms
 * Mollusks
 * Athropods

**Annelid ( worm/ earthworm ) ** Pictrure from []

<span style="font-family: Georgia,serif; font-size: 110%;">**Echinoderms ( star fish, sea urchins, sea cucumbers, crinoids, and sand dollars )** Picture from []

<span style="font-family: Georgia,serif; font-size: 110%;">**Mollusks ( mussels, urchins, octopus, clams, snails, oyster, sea cucumbers, oysters, chiton, squid, etc.. )** Picture from []

<span style="font-family: Georgia,serif; font-size: 110%;">**Athropods ( spiders, beetles, butterflies, moths, walking sticks, grasshoppers, and dragonflies ) Picture from** []

- Some invertebrates such as the bee, pollinate many different kinds of plants allowing them to grow. A lot of other insects eat pollen, making them not just eat the pollen but the plant also. Pollination is very important because one third of the human food supply is crops which need this in order to grow.
 * Disadvantages:**

- Invertebrates trying to survive sub-zero temperatures.

- Today, many invertebrates are used for animal testing, although there are many benefits of using invertebrates for animal testing it also has its disadvantages. They do not have the adaptive immune system like some other animals. Usually the difference between invertebrates and humans makes it so there's a very low success rate to finding uses in medicine and health. Also, invertebrates can not help the development of cancer drugs, vaccines and the understanding of the way humans live. Lastly, invertebrates have different types of diseases compared to humans, so they do not help with biomedical research testing.
 * Human activities that have impacted on a disadvantage:**