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Only The Activities Of Breeders: REVERSION, re-vur'shun, or ATAV in biology, the reappearance of an ancestral in plants or animals derived from parent; grandparents which do not themselves exhibi trait. Plant and animal breeders have occasic observed a line of domesticated organisms to rise suddenly in one generation to indivi possessing some characteristic like that of re ancestors but not known in the intervening ge tions. Breeders formerly attributed this reve to the ancestral type to various mysterious fo The scientific explanation depends on hered mechanisms discovered by Gregor Johann Me (1822-1884) and later geneticists.
Today we are only the activities of breeders at the beginning of breeder-reactor technology. Many problems still must be solved. Experiments have shown that, in most cases, the breeder reactor's heat out¬put is far greater for its size than today's more conventional machines, the thermal reactors. However, because uranium breeders require neutrons at far higher energies than those of thermal reactors, breeders can be more dangerous. As yet, engineers have not built a successful, full-scale breeder that can produce electric power economically, but there is little doubt that they will eventually do so.See Also Field Activities Undoubtedly:Games occupy a very important place in school and early adult life in Britain, and the proportion of the population that keeps active in them throughout life is strikingly large. Of the variety of such outlets available to Britons of all ages, track and field activities undoubtedly offer the widest scopes.
Track. Britons take part in track and field events at club meets and in international compe¬titions. Running for physical fitness is also a popular pastime. Long before the craze for jog¬ging hit the United States, thousands of runners were seen on Britain's roads and fields.
Because the reviews are inter¬pretive rather than documentary, they help the reader learn which of the many achievements in a particular field were most significant to an authority in that field. Occasionally a particularly significant development is highlighted as a "Breakthrough" on a special page. A brief addendum at the end of each review describes other events and activities in the discipline, but with¬out the interpretive comments of the reviewer.
On The Other Hand See Normal Activities Freely:Both adult water beetles and their larvae may be maintained in an aquarium. Both will carry on their normal activities freely. As they are vicious and voracious, they cannot be maintained with other aquarium inhabitants.
Beetles need "balanced" aquarium (see Part II); use 2- to 5-gallon aquarium or aquarium jar. Cover bottom with 2 inches of clean aquarium sand; anchor 6 strands of common aquarium plants with a few clean rocks. Let water stand 24 hours; then drop adult beetle or larvae or both in habitat.
Black widows must be housed alone; otherwise, they kill each other. Quart jar sufficient, as spider needs little space for movement. Keep top screwed on, but punch air holes. Spider adjusts itself to captive quarters and carries on normal activities; spins web from sides of jar to lid; rests on undersurface of lid. |
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