If the environment changes, why can a previously useful trait become less useful later?
Answer and explanation
Correct answer: Because the advantage of a trait depends on environmental conditions
The governing concept is the environment-dependent nature of fitness. A trait is not universally beneficial; its value depends on factors such as climate, food, predators, disease, and competition. When these conditions change, a trait that once improved survival may provide little advantage or even become harmful. Selection may then favor different variants. Therefore A is correct; B and C deny environmental effects, while D wrongly claims that selection stops.
Frequently asked questions
What is the correct answer to this question?
Because the advantage of a trait depends on environmental conditions
Why is this the correct answer?
The governing concept is the environment-dependent nature of fitness. A trait is not universally beneficial; its value depends on factors such as climate, food, predators, disease, and competition. When these conditions change, a trait that once improved survival may provide little advantage or even become harmful. Selection may then favor different variants. Therefore A is correct; B and C deny environmental effects, while D wrongly claims that selection stops.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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