Crayfish is the name of a genus of fish. Crayfish are small freshwater fish that live in the aquatic environment. They usually have a long, thin body with a large head and mouth. The front half of their bodies are covered with spines, and th...
Do amphibians have scales made of keratin? Do nematodes have tissues? Do members of the phylum Crustacea have chela? Do nematodes have a complete digestive system? When did the radula develop in the phylum Mollusca? Do amoebas have cilia?
Mollusks have a coelom and a complete digestive system. ... Aquatic mollusks “breathe” under water with gills. Gills are thin filaments that absorb gases and exchange them between the blood and surrounding water. Mollusks have a circulatory system with one or two hearts that pump blood. What...
They are carnivores, which means they like to eat meat, so they catch fish, other crabs, worms, squids, starfish, and snails. They hunt along the sea floor for animals that are partly covered by sand. Dungeness crabs will also eat fish eggs, and will even eat other Dungeness crabs!
How do porifera circulatory system? Sponges do not have nervous, digestive or circulatory systems. Instead, most rely onmaintaining a constant water flow through their bodies to obtain food and oxygenand to remove wastes. Are sponges aerobic?
sandrelatedlowmolecularweightglycosidesinpyloriccaecaandstomachofthestarfishPatiria(=Asterina)pectiniferacollectedatonelocationnearVladivostokhavebeenstudied.HPLCanalysisonthefractionscontainingthesesubstancesshowedafairlyconstantcompositionofsteroidsindigestivetissuesofP.pectiniferainspiteofsmallseasonalvariationsintherelative...