地球温暖化の影響が加味されることにより、いわゆる気候の極端化が発生し、干ばつや高温などが増えたり強まったりして、生物が危険にさらされるリスクが増すと考えられている。生態系への主な影響例として、寒冷地に生息する動物（ホッキョクグマ、アザラシ）の減少などがあげられる。ホッキョクグマは、哺乳綱食肉目クマ科に分類されるクマ。

Polar bear Quiz

Choose the correct answer.

1. The polar bear is native to the ( ).

a.Arctic

b.Antarctic

c.Hokkaido

2. The polar bear is ( ) species at high risk of extinction.

a. an immortal

b.a vulnerable

c.an invulnerable

3.Zoologists believe that the projected decreases in the Polar Sea ice due to ( ) will reduce their population by two thirds by 21st century.

a.acid rain

b.air pollution

c.global warming

4.Although the fur appears white, in fact the individual hairs are ( ).

a.transparent

b.translucent

c.clear

5.Polar bears are enormous, aggressive, curious, and potentially( ) to human.

a.dangerous

b.safe

c.secure

6.The polar bear is the most ( ) member of the bear family.

a.herbivorous

b.omnivorous

c.carnivorous

7.Polar bears are excellent ( ).

a.runners

b.swimmers

c.hunters

8.About 60% of the world's polar bears live in ( ).

a.Canada

b.Russia

c.America

9.The bears sometimes have problems with various skin diseases with ( ).

a.Gastritis

b.Dermatitis

c.Canker sore

10.Global warming has already had an impact on polar bear population health and ( ).

a.size

b.life

c.illness

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Created by Aimi Kibushi