Baby Animals - download pdf or read online

By Richard Northcott

Рабочая тетрадь для начинающих изучать английский на тему Животные и их детеныши.

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They arose in the Silurian, possibly as a freshwater group, and radiated widely in both fresh water and the sea. Life in each of these environments presents physiological problems. In fresh water, the blood and tissue fluids of bony fishes are hypertonic to the surrounding medium, and there is a need to combat ~he constant uptake of water by osmosis. This is achieved by the excretion of large amounts of water through the kidney. In the sea, the problem is reversed for the body fluids of the bony fish are then hypotonic to sea water, and there is a consequent danger of water loss.

The members comprise the great majority of vertebrate animals, and originated in the Silurian period. INFRAPHYLUM SUPERCLASS _ - - - - PISCES GNATHOSTOMATA - - - - 4 ~---- TETRAPODA The evolution of jaws was a major advance which changed the whole mode of life of the early fishes. ier mandibular, or Meckel's, cartilage. al bones and in the higher Gnathostomes these gradually replace the cartilaginous elements. In most modern fishes, the jaws are suspended from the hyomandibula (hyostylic suspension).

There is no spiracle. 4. The upper jaw is solidly fused to the braincase. and the hyomandibular arch is not involved in jaw suspension. • 5. The dentition is reduced; 3 flattened crushing plates are present. two on the upper and one on the lower jaw. • 6. The body is without scales. • 7. The males have a club-shaped clasper on the head in front of the eyes. 8. The members are marine fishes widely distributed in coastal waters around the world. They have a grotesque appearance and are often given the name 'ratfish' on account of the elongate tail.

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Baby Animals by Richard Northcott

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