Polar Bears

What was the initial cause for brown bears to move north into the Arctic?

• A search for warmer climates

• A natural disaster in their original habitat

• A scarcity of food in southern regions

• An unusually warm period allowing forests to grow

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

What is the primary environment of the Arctic where the polar bears evolved?

• A mountainous region

• A desert with sparse vegetation

• A cold ocean environment with ice

• A dense forest

Which trait was NOT mentioned as an adaptive trait for polar bears?

• Ability to digest seal meat

• Transparent fur

• Jagged molars

• Longer claws

Tags

NGSS.MS-LS4-2

NGSS.MS-LS4-4

What is the main reason transparent fur is advantageous for polar bears?

• It makes them more attractive to mates

• It allows them to see better in the dark

• It helps them swim faster

• It provides better camouflage in the snow

How did the jagged molars benefit the Arctic bear population?

• They helped in climbing trees

• They improved the digestion of plant material

• They aided in chewing and digesting meat

• They were used for defense against predators

Tags

NGSS.MS-LS4-2

What was a key food source for bears in the Arctic?

• Seals

• Fish

• Insects

• Berries

What process led to the evolution of polar bears from brown bears?

• Artificial selection

• Genetic engineering

• Natural selection

• Spontaneous generation

Tags

NGSS.MS-LS4-2

NGSS.MS-LS4-4

What is the main reason polar bears became a separate species from brown bears?

• Sudden climate change

• Introduction of new predators

• Gradual accumulation of adaptive mutations

• Immediate environmental changes

Tags

NGSS.MS-LS4-4

What is the color of polar bear fur, according to the text?

• White

• Brown

• Transparent

• Gray

Why did the brown bear population in the forest remain similar to their ancestors?

• They were isolated from other species

• They migrated to other regions

• Their environment did not change much

• They had no mutations