Unit 1 · Characteristics and Classification of Living Organisms
Question Bank
Cambridge IGCSE Biology 0610 · 79 questions
Q34Characteristics and Classification of Living Organisms
Which evidence gives the most reliable measure of how closely two species are related?
(a)Colour of their skin
(b)Size of their bodies
(c)Where they live
(d)Base sequences of their DNA
Correct answer: (d) Base sequences of their DNA
Explanation: DNA base sequence similarity reflects how recently species shared a common ancestor.
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