Titlebook: Animal Life in Fresh Water; A Guide to Fresh-Wat Helen Mellanby Book 1963 Helen Mellanby 1963 evolution.invertebrates.physiology.Model inve

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The Polyzoa or Moss Animalcules,ciliated, and the cilia make currents which collect the small organisms used as food, and transport them to the mouth. Polyzoa possess a proper gut, which terminates in an anus; ovaries and testes (they are hermaphrodites); and a rudimentary nervous system. The fresh-water polyzoa reproduce asexuall

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The Protozoa,g animals, feed by taking in complex food substances (i.e. by eating other animals, plants, or their decaying remains) which were ultimately produced by growing plants. The Protophyta feed for the most part like typical green plants — they contain chlorophyll which enables them to synthesize carbohy

Delirium

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Heinrich Walter,Siegmar-W. Brecklef ponds and streams are very common, and are likely to be among the first living things to be observed by anyone beginning to study natural history. Many of them are large enough when adult to be studied without the aid of a microscope, though a hand lens will be useful even for them, in making out the details of their structure.

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