Part A: In a large lake, a population of bottom-dwelling fish has two inherited color patterns: silver scales with blue stripes and brown scales with stone gray spots.

Part B: Scientists compared the bottom-dwelling fish population over a ten year period

In a dense forest, a population of beetles has two inherited color variations: bright red and light green.

In a meadow, some flowers are bright red and some are dull pink. Flower color is inherited.

In a lizard population, some trait differences are inherited and some are not.

A population of finches on an isolated island has significant variation in beak size and shape (from small and delicate to large and strong).