Related Discussions:- Do sponges have circulatory system Phosphorus cycle - nutrient cycles, Phosphorus Cycle - Nutrient Cycles ... Phosphorus Cycle - Nutrient Cycles Phosphorus is a very important nutrient because of its role in the form of phosphate, in reactions that store and release energy. Diffusion is the most simplest form of circulating materials. They have partially differentiated tissues, and not true tissues.Sponges don't have internal organs. Join Yahoo Answers … Sponges, Jellyfish, Flatworms and nematodes (nematodes have fluid-filled body cavity lying inside the external body wall fluid but no vessels) are avascular animals. advantage of the occurrence of sperm cells and larval stage in the life cycle of sponges? Instead, most rely on maintaining a constant water flow through their bodies to obtain food and oxygen and to remove wastes. 12. Sponges don’t have internal organs. 1. 11. Click to see full answer. Sponges have no distinct circulatory, respiratory, reproductive, digestive, nervous, or excretory organs and system. 1 Answer. Instead of a mouths they have tiny pores in their outer walls through which water is drawn. The circulatory system varies from simple systems in invertebrates to more complex systems in vertebrates. Most sponges inhabit marine environments but a few species live in freshwater habitats. Sponges work like a chimney, gaining water via cells throughout their body, then expelling it through the mouth-like osculum at the top. Corals, Coelentrerates, have a gastrovascular system. The sponges' cells absorb oxygen by diffusion from the water flow system, into which carbon dioxide and other soluble waste products such as ammonia also diffuse. They do not have organs and their cells are not organized into well-defined tissues. Porifera, or sponges, lack circulatory systems in the strictest sense, but to make up for this they transport food through a system of moving water. Do sponges have respiratory organs? Find answers now! Fossil sponges come from the same time as the oldest fossils.There a re about 5000 species of sponges, with three distinct groups. Sponges do not have nervous, digestive or circulatory systems. 10. The water around the animals contains oxygen and … Yes, water transport. Seawater is the medium of transport and is propelled in and out of the sponge by ciliary action. 0 0. They rely on keeping up a constant water flow through their bodies to obtain food and oxygen and to remove wastes. Instead of a mouths they have tiny pores (ostia) in their outer walls The phylum cnidaria contains a wide variety of animals that live in an aquatic setting. Q: Do all animals have a circulatory system? Their walls are lined with many small pores called ostia that allow water flow into the sponge. 1 Questions & Answers Place. They don't have muscles, a nervous system, or a circulatory system. They all have the same circulatory system. Circulatory System Variation in Animals. Sponges do not have a true circulatory system, however, flowing water is used instead. They range in heights of 1-200cm and in diameters of 1-150cm. Reproduction in sponges can be asexual by budding, gemmation or fragmentation (regeneration) or sexual with a larval stage (a ciliated amphiblastula larva). Echinoderms such as Starfish and Sea Urchins do not have true circulatory systems either. Sponges have a unique feeding system among animals. They rely on keeping up a constant water flow through their bodies to obtain food and oxygen and to remove wastes. They don’t have muscles, a nervous system, or a circulatory system. 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