This Week In Science #8

This week in science we were able to dissect animals. Our choices were a grasshopper or crayfish. My partner and I chose to dissect a crayfish. What I did was first learn the anatomy of the crayfish. Then after learning the anatomy we took a whole crayfish an we were able to see the anatomy in person. Afterwards we began the dissetion. We were able to see and indentify the parts of an crayfish. We could see the dorsal view when we put it on its stomach, the ventral view when it was on its back. The posterior part of the crayfish is the tail and the anterior is the head. The crayfish are able to adapt to many environments except very cold ones. They live in environments such as marshes, rivers, lakes etc. They are not able to survive long in salt water, due to their genetic make up features of not being able to sustain in that type of environment.

I learned that there are more body parts to a crayfish then meets the eye. They are invertebates meaning they don't have bones. It also has 5 legs on each side of its body. They also have an exoskeleton that protects their inner body parts from harm against predators. Some can grow to the size of a cat, while others are as tiny as a thumbnail. They also have pinchers to ward off predators. They have antennas to feel, see, and taste things.