Natural Selection in a Changing Environment

57 questions on this block. Tap an answer and it moves on by itself — correct answers advance immediately, misses hold a few seconds so you can read why.

The background decides What changed? Which variant now matches? It survives and reproduces more, so its frequency rises — and keeps rising as long as the change lasts.

Warm-up · not scored

Click the buttons and watch what changes.

Birds eat the moths they can see. The moths that match the background survive and reproduce more, so their share of the population keeps rising while the change lasts.

Part 1The peppered moth

Part 2Reading frequency graphs

Part 3Predicting what comes next

Part 4Simulations and data

Part 5Adaptations and differential success

Part 6Applying the models

Natural Selection in a Changing Environment

Warm-up · not scored

Review Complete

Worth another look