The Similarities Between Earthworm And Crayfish

Students observe and record some of the structures of a crustacean, the crayfish, and compare it to other organisms. They establish a feeding and maintenance schedule for the organisms. Students investigate crayfish behavior and map where the crayfish spend time within their habitat. Through readings, organism cards, and a video, students learn about adaptations of organisms in different environments. Students engage in an outdoor simulation activity to explore food chains.

Crawfish are delicious crustaceans that closely resemble lobsters. Many people consider crawfish to be as delicious as lobsters, which is why these crustaceans are harvested all over the world. In the U.S., crawfish are closely associated with the haute cuisine and culture of Louisiana. In fact, crawfish are the official crustacean of the state. I normally prefer to harvest or purchase crawfish on the day I intend to cook them. However, many people prefer to purchase and eat them later but do not know how to keep crawfish alive in a sack or container for several days before finally preparing and eating them. Fortunately, I will provide you with some tips on how I keep my crawfish fresh and healthy

If mealworms prefer potatoes over fish food when they’re put into a choice chamber and are able to move however they like for 10 minutes, then the mealworms will make their way to the chamber with the potato in it.

If mealworms are attracted to moisture, and tend to move away from hardened food, why would the mealworm move towards bran flakes and begin to go inside the pile.

Crayfish, Orconectes propinquus, are ectotherms that do not generate internal heat and rely on external temperatures to determine their body temperature. The crayfish we tested were found in Medway Creek and therefore undergo considerable temperature changes throughout the year. Since these crayfish are able to adapt to various temperatures allowing them to live in numerous places, their survival rate would be higher than many other organisms.

First of all, the human body, crayfish, earthworm, and frog all have many similarities and differenced about how their digestive system works. They all eat their food through their mouths and the food then travels into the esophagus. The esophagus prepares the food for further digestion. The food in the esophagus then travels in the frog, crayfish, and human body’s stomach. The earthworm doesn’t have a stomach, but it has a crop that serves as a storage stomach. Once the food is in the stomach, something different happens for each organism. The food in the crayfish travels to the digestive gland which produces digestive substances and from which the absorption of nutrients occurs. The same thing occurs in a frog and the human body, but instead of a digestive gland it is moved into a small intestine. In the earthworm, the food goes from the stomach to the gizzard, which uses stones that the earthworm eats to grind the food completely. After it is moved into the digestive gland, small intestine, or gizzard, the food is mostly digested. The earthworm and human body’s food is now moved into the larger intestine, where it absorbs water and any remaining nutrients. The frogs food is stored in something like a large intestine, but it is called the gallbladder. The crayfish only has on intestine. After going through all this, the undigested material leaves through the anus, or for a frog, it is called the cloaca.

Phylum: Chordata, an organism who developed a notched, a nervous system with that contain gill cleft with the vertebrates.

Some of the similarities that are between both is that the digestive system is some what similar to the human digestive system. How that works is all the food goes down in the mouth first and then goes to the Crop, in which is the stomach of the worm. It stores there for a bit until it goes to the Gizzard in which that would break down the nutrients that the worm needs in its body. In which the waste will soon leave out of the body for both of them. They also have pharynx in which is part of the throat and the esophagus in which is the part that carries the food to the stomach.

They must be eukaryotic, meaning they have nucleus, and in the domain Eukarya. In the Linnaean classification this could be in the kingdom Protista like a paramecium. Another Linnaean classification of this could be in kingdom Animalia, since they are heterotrophs and their cells contain a nucleus. They could be grouped as predators, since the organism is engulfing another organism. They could also be grouped based on their locomotion. They could have cilia, legs, or even flagella.

of the skin, skeletal muscles, bones and joints. The visceral division on the other hand carries

Daphnia belong to the phylum of arthropod; the subphylum of Crustacea; the class of brachiopod; and the order of Cladocera.

Dugesia tigrina are flatworms of the Turbellaria class that can live in saltwater or freshwater environments (Reddien and Alvarado 2004). These flatworms are also known as planaria and are notorious for their great ability of regeneration. The purpose of this experiment was to test if the regrowth of the planarian limbs was affected by light.

Consist of oral cavity, esophagus, gallbladder, liver, stomach, duodenum, pancreas, colon, cecum, appendix, jejunum, and rectum.

The horseshoe crab and the trilobite do share a common ancestor. There are many pieces of evidence in the anatomy of both species that support this claim. A first piece of evidence is that both species have an outer exoskeleton but no internal skeleton. This separates both of them from vertebrates, making both of them invertebrates. The second piece of evidence supporting walking legs of both species are also positioned on the underside of the animal, protected under the shell. Both the trilobite and the horseshoe crab have one horseshoe-shaped cephalothorax with a raised ridge in the middle of it and two eyes positioned on either side of the ridge. The mouth of both species is on the underside of the body as well, unlike crustaceans and insects

Is the circulatory system of arthropods more similar to that of annelids or of mollusks? Why?