Sponges are extremely slow-moving or sessile filter-feeders that draw water through pores and specialized filter cells to gather food. Sponges are the most primitive type of animal in existence, featuring a cell-based organization where different cells have different tasks, but do not form tissues. All sponges live in the water, with a large majority of species living in the oceans.Know More
Sponges gain their structure from a skeleton of collagen with reinforcing spicules of either calcium or silicon compounds. They are either radially symmetrical or asymmetrical. These structures are full of pores in which specialized collar cells sit, constantly drawing in water and filtering out food particles. The waste water is then pushed into a central chamber and out a large opening.
Sponges do not have tissues; thus, they do not have cardiovascular or nervous systems, nor do they have any muscles or sense organs. Some species of sponges produce only one type of gamete, while others produce both. Sponges release sperm into the water; there they are captured by other sponges just like food particles. However, the collar cells change when they encounter gametes, enabling them to carry the cells to their own eggs. Sponges also sometimes reproduce asexually via budding.Learn more about Biology
According to the University of Wisconsin La Crosse, sponges can reproduce asexually through external budding, gemmules (or internal budding) and the regeneration of broken pieces that develop into full-bodied sponges themselves. Sponges can also reproduce sexually.Full Answer >
Water is important because the human body has a drought management system that prevents dehydration and water is the most crucial part of that system. Water also helps regulate body temperature, serves as a lubricant and is a natural headache remedy (headaches can be a sign of dehydration).Full Answer >
The main characteristic of archaebacteria and eubacteria are that they are unicellular, or single-celled. Archaebacteria are only found in hot boiling water or other types of extreme environments, while eubacteria are found all over.Full Answer >
Members of Monera, which include the prokaryotic bacteria and cyanobacteria, are single-celled and lack a membrane-bound nucleus. They also lack other membrane-bound organelles, such as mitochondria, and reproduce asexually.Full Answer >