Grzimek's Animal Life Encyclopedia. Lower Metazoans and by Michael Hutchins

By Michael Hutchins

V. 1. decrease metazoans and lesser deuterostomes / Neil Schlager, editor -- v. 2. Protostomes / Neil Schlager, editor -- v. three. bugs / Neil Schlager, editor -- v. 4-5. Fishes I-II / Neil Schlager -- v. 6. Amphibians / Neil Schlager, editor -- Reptiles / Neil Schlager, editor -- v. 8-11. Birds I-IV / Donna Olendorf, venture editor -- v. 12-16. Mammals I-V -- v. 17. Cumulative index.; ''This is a revised and up to date version of 1 of the main authoritative and complete assets at the world's animals. just like the 1st version written by means of famous zoologist Bernard Grzimek and released in 1972, the second one variation covers all kinds of animals in geographic parts world wide. It comprises top quality photos and illustrations and a finished index to all volumes.''--''The most sensible 20 Reference Titles of the Year,'' American Libraries, may possibly 2004

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Grell, and A. Adouette. ” EMBO 10 (1991): 499–503. Field, K. , et al. ” Science 239 (1988): 748–753. , and R. M. Kristensen. ” Nature 378 (1995): 711–714. 14 Nielsen, C. ” Evolution & Development 5 (2003): 386–393. Rieger, R. M. ” Verhandlungen der Deutschen Zoologischen Gesellschaft 79 (1986): 31–50. Rieger, R. , and P. Ladurner. ” Belgian Journal of Zoology 131 (2001): 27–34. , Y. Zhang, and A. H. Knoll. ” Nature 391 (1998): 553–558. Rick Hochberg, PhD Grzimek’s Animal Life Encyclopedia ••••• Reproduction, development, and life history What is a life history?

At the other end of the scale of complexity, such animals as roundworms and flatworms develop elaborate gonads and ducts; these structures include discrete testes with sperm ducts, discrete ovaries with oviducts, and even numerous types of specialized reproductive glands. In some respects, the parasitic flatworms have the most structurally sophisticated reproductive systems in the animal king20 Structural maturation of the sex organs and gametes is often accompanied by certain changes in behavior as well as the development of special structures that are not gonadal but are nonetheless related to reproduction.

These carnivorous sponges capture and hold small crustaceans with their spicules, which act like Velcro® tape when they come in contact with the crustaceans’ exoskeletons. Once captive, the crustaceans cannot free themselves. They struggle for several hours, which indicates that the spicules do not produce any paralyzing or toxic secretions. Cells then migrate around the helpless prey, and digestion takes place outside the cell walls. Most cnidarians are carnivorous, using cnidocytes on their tentacles to capture prey.

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