Which of the following is an example of a niche?

a.

a squirrel living in a tree.

b.

a fish in a pond.

c.

a lion hunting for zebra in a grassland.

d.

two birds flying in the air.

Some tools have graduations to show multiple measurements. for example, a ruler may have graduations for both millimeters and centimeters. when measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters