Animal Testing Details And Statistics
Animal Testing Details And Statistics The Lophotrochozoa contains the molluscs, annelids, brachiopods, nemerteans, bryozoa and entoprocts. The molluscs, the second-largest animal phylum by number of described species, consists of snails, clams, and squids, whereas the annelids are the segmented worms, such as earthworms, lugworms, and leeches. These two groups have lengthy been thought-about shut relatives as a end result of they share trochophore larvae. Animals are found as way back as the Ediacaran biota, towards the top of the Precambrian, and probably somewhat earlier. It had lengthy been doubted whether these life-forms included animals, however the discovery of the animal lipid cholesterol in fossils of Dickinsonia establishes their nature. The blue whale is the largest animal that has ever lived, weighing as much as a hundred ninety tonnes and measuring as a lot as 33.6 metres long. Animals have evolved quite a few mechanisms for avoiding close inbreeding. Sexual replica is