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Question 18M.1.HL.TZ2.21

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.1.HL.TZ2.21
Level HL Paper 1 Time zone TZ2
Command term Question number 21 Adapted from N/A
21.
[Maximum mark: 1]
18M.1.HL.TZ2.21

Which example shows disruptive selection?

A. Giraffe necks have become longer over time.

B. Medium-sized beaks in hummingbirds have decreased in frequency over time.

C. The peppered moth became less common in polluted environments.

D. Human babies with a very high or a very low birth mass have a higher mortality rate. 

[1]

Markscheme

B

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