Сответом! since ancient times nature man, being the source of his life. a) is serving b) serves c) has served d) serve

Since ancient times Nature ___ Man, being the source of his life.
c) has served

1. My English teacher asked me yesterday. 2. He often operates the ship, when he is on watch. 3. The ship is often operated by him when he is on watch. 4. Our Radio-officer will transmit a radiogram in 5 minutes. 5. Radiogram will be transmitted by our Radio-officer in 5 minutes. 6. The sailors painted the ship's hull yesterday. 7. The ship's hull was painted by our sailors yesterday. 8. He received the weather information an hour ago. 10. They will launch a new vessel next month. 11. A new vessel will be launched next month. 12. Napoleon invaded Moscow in the 18th century. 13. Moscow was invaded by Napoleon in the 18th century. 14. Admiral Macarov designed the ice-breaker "Yermak". 15 The ice-breaker "Yermak" was designed by Admiral Macarov.

Ordinary fox - one of the most famous inmates of our forests . With a modest size , it still is a close cousin of the wolf and has a no less predatory disposition. So, what kind of animal red fox : a description of the animal, its habits , nutrition and economic value are set out below .Appearance FoxAll canines have total contrast - pointy ears and snout, thin legs , nevtyazhnye claws and a bushy tail . Fox tail is also used as a " blanket" , covering their nose and front legs during sleep in the winter .Generally red fox - an animal of medium size with a long, very beautiful tail and large pointed ears . Breast foxes white, body length of 60-90 cm, 50-60 cm tail ears on the back side is black and white tail tip , and there are black spots on the legs. Color red , sometimes with a dark cross on his shoulders.Color and size of foxes differ in varying terrain. In total there are 40-50 subspecies , there are also smaller forms . In general , as you move north foxes are bigger and brighter on the south - are smaller and dimmer. But this is the most common color: bright red back , white belly , dark paws . Foxes often have brown stripes on the blades and spine , similar to the cross.Molting foxes begins in the spring - in February-March and ends in late summer. After this, she immediately starts to grow thick winter fur , which the animal is fully clothed in November or early December . During this period, she is the most red, animal similar colors in our forests anymore. The summer fur is always more rare and short, and winter , on the contrary , more dense and lush.Distribution and behaviorRed fox lives everywhere except in the Arctic tundra and some islands . In areas with snowy winter she tries to avoid continuous taiga arrays.Fox , like most predators do not usually hunt near his lair.