Question

1. why are krill important in the polar ecosystem?

a. they form a major part of the food web
b. they help with ice formation
c. they fertilize the soil
d. they clean the ocean floor

Explanation:

In polar ecosystems, krill are a key component of the food web. Many marine animals like whales, seals, and fish rely on krill as a primary food source. Option b is incorrect as krill don't help with ice formation. Option c is wrong because krill live in water and don't fertilize soil. Option d is incorrect as krill are pelagic (live in open water) and don't clean the ocean floor.

Answer:

a. They form a major part of the food web