Origin of the species
Initially it was assumed that the polar bear separated from brown about 45-150 thousand years ago, probably in the territory of modern Ireland. However , a recent study showed that the polar bear separated from their common ancestor with brown bear 338-934 thousand years ago ( an average of 600 thousand years ago) , and 100-120 thousand years ago by crossing species representatives took their hybridization , resulting in all modern polar bears are descended from these hybrids .Appearance
Head bears. From left to right : Brown , Black, White .Polar bear - one of the largest terrestrial carnivorous mammals of Representatives . Its length is 3 m , weight up to 1 ton Usually males weigh 400-450 kg , body length of 200-250 cm, height at the withers 130-150 cm Females noticeably smaller ( 200-300 kg). The smallest bears are found on Spitsbergen , the largest - in the Bering Sea .Polar bear from other bears distinguish long neck and flat head . His skin is black. Fur color varies from white to yellowish ; summer fur may turn yellow due to constant exposure to sunlight . Polar bear fur is devoid of pigment stains, and hollow hairs . Translucent hairs allows only ultraviolet rays, giving the coat insulating properties . When ultraviolet photography polar bear seems dark . Due to the structure of the polar bear hairs can sometimes " go green ." It happens in a hot climate ( in zoos ) , when inside hairs infest microscopic algae .<span>Soles of the feet are hit wool, not to slip on the ice and not freeze. Between the fingers has a flipper and the front paws trimmed stiff bristles. Large claws can keep even a strong prey.</span>
Present Simple
Does he play football?
What does he do?
Present Continuous
Is she sleeping?
What is she doing?
Present Perfect
Have you been to London?
What have you done?
Pres Perf Continuous
Have you been playing tennis for 2 hours at 3?
What have you been doing?
Past simple
Did you to school yesterday?
Where did he go last summer?
Past Continuous
Were you sleeping when I called you?
What were you doing when I called you?
Past Perfect
Had the bus left before we came to the bus stop?
What had happened before we came home?
Past Perfect Continuous
Had she been lying in the sun?
What had she been doing before we came home?
Future Simple
Will you go to Italy next year?
What will you do tonight?
Future Continuous
Will she be playing tennis at 5 tomorrow?
Where will she be going at 5 tomorrow?
Future Perfect
Will you have done your homework by 5 o'clock?
When will he have come by 6 tomorrow?
Future Perfect Continuous
Will she have been doing her homework for three hours at 7 tomorrow?
What will they have been doing since morning tomorrow?
2.This is a school 4.This is a forest 11.This is a bush 7.this is a garage door
I spent less money than you