Biology
Grade-9
Easy
Question
______________ is a force that causes groups of organisms to change over time.
- Mutation
- Variation
- Natural selection
- Reproduction
Hint:
Changes in a group of organisms are caused by many factors like, variations, mutations and environmental factors. It helps in evolution.
The correct answer is: Natural selection
By the example of Darwin's Finches, we can say that group of organisms adapts according to their changing environment. that is why they change overtime.
- A group of organism changes overtime because of variations.
- These variations are caused during sexual reproduction.
- Changes are also caused by mutations. These are sudden changes that are caused on genetic level.
- So, all these changes caused in a group of organisms are developed in next generations only if these are helpful for them to survive in the changing environment.
- This is called adaptation. Only such changes are developed in generations of organism that helps them to evolve.
- So, nature selects only those who can survive better in the changing environment. This is called natural selection.
- This concept was given by scientist Charles Darwin. So, natural selection acts as a force that causes group of organisms to change overtime.
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