By Michael Hutchins
A few reviewers name "Grzimek's Animal existence Encyclopedia the easiest reference paintings on animals ever released. Others name it the legacy left to us via famed zoologist and animal lover, Bernhard Grzimek. the unique set, released in Germany within the overdue Nineteen Sixties, is across the world well known for its clinical reporting, assurance and illustrations, and serves as a tremendous element of reference for researchers and scholars learning the animal nation. Thorough articles familiarize readers with animals came upon all over at the globe, detailing their existence cycles, predators, nutrients structures, total ecology and lots more and plenty extra. Thomson Gale proudly provides the 1st thoroughly revised and up to date model of this acclaimed set in 30 years. Staying precise to the unique clinical pedigree, our new variants of "Grzimek's Animal lifestyles Encyclopedia are guaranteed to serve the wishes of scholars at each educational point.
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Extra resources for Grzimek's Animal Life Encyclopedia, 17 Volumes Set
Sample text
Within these basic functional forms of cleavage, there are many variations in the specific spatial configurations and the extent of cell division. Most protostomes undergo some type of holoblastic cleavage, in which the two daughter cells become completely separated, each with its own complete cell membrane. This type of cleavage may be described as either equal cleavage or unequal cleavage, depending on whether the daughter cells are equal in size. Most protostomes exhibit unequal holoblastic cleavage.
These analyses furthermore place the flatworms in a more apomorphic position on the tree, indicating that what were regarded as primitive and ancestral conditions are really either secondary losses, or that the ancestor was quite different from present notions of it. Morphological characters still suggest that the first protostomes were vermiform (worm-shaped) animals like the ribbon worms in phylum Nemertea. Other taxa with wormlike ancestral features include the sipunculans (phylum Sipuncula) and the echiurans (phylum Echiura), which are animals that burrow into sediments on the ocean floor by using the large trunk coelom for peristalsis.
The outer ectoderm layer will develop into external structures such as the epidermis, skin, exoskeleton, nervous system, and sensory structures. The middle mesoderm layer becomes internal organs such as kidneys, reproductive systems, circulatory systems, and muscles. The inner endoderm layer will develop into the gut cavity and its derivatives, such as the stomach, intestine, and liver. Above the level of flatworms, all higher animals possess an additional mesodermal feature—a membrane-lined body cavity, or coelom.