A trait that increases an organism's chance of survival is called:

Correct answer: (b) Adaptation

Explanation

An adaptation is a feature (of structure, function or behaviour) that helps an organism survive and reproduce in its environment, such as the thick fur of a polar bear or the long neck of a giraffe. Adaptations build up through natural selection: individuals with useful traits survive and pass them on.

• A mutation is a change in the DNA; it may be useful, harmful or neutral.
• Variation is the difference between individuals, the raw material of selection.
• A hybrid is the offspring of two different varieties or species.