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Polar bear - one of the largest land predators on our planet.Typically, males weigh about 500 kg , females are twice smaller. Move rapidly on ice. Lead a solitary life, but sometimes there are groups of 2-5 animals ; some bears can gather around a big fall . Peace for the polar bear is limited ice fields . This beast of the Arctic zone - and food, and shelter , he finds the endless ice and hummocks. The polar bear has an incomparable resistance to cold. Its long fur thick consists of a hollow in the middle of the hair containing air. Polar bear fur retains heat well so that it can not detect infrared aerial photography.Home victim of a polar bear - arctic seals . Seal hunt , bear shows surprising ingenuity and resourcefulness , he can slowly sneak up on their prey on the ice , watch for the water, or chosen for her in the water.

1. Crop production fields will have (Future) numerous descriptors and variables.
2. Public enterprises used (Past) computers for common financial and business tasks such as inventory, payroll, accounting, and taxes.
3. Good agricultural research needs (Present) computers for statistical data processing, generation of mathematical models, and control of research devices.

1. Wind is another climatic factor influencing (определение) crop production.
2. The farmer was using (часть сказуемого) new methods of farming.
3. When harvesting (обстоятельство) the farmer used his new harvesting combine.

1. This work will be playing (Future) an important role in improving livestock.
2. He was cutting (Past) down the trees, when I saw him.
3. In traditional methods of agriculture agronomists are studying (Present) soil, water, sun, plants, air, microorganisms.