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1. What role does variation within a population play in the process of natural selection?
2. How does the environment influence which traits become more common in a population over time?
3. How do fossils provide evidence that species have changed over time rather than remaining the same?
4. What information can scientists learn by comparing fossils found in different rock layers?
5. Why are transitional fossils important when studying evolutionary relationships between organisms?
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1. Variation gives natural selection something to work with. Individuals in a population are not all the same — they have different traits (like color, size, or beak shape). When some traits help an individual survive or have more babies, those traits become more common over time.
2. The environment “picks” which traits are useful. Traits that help an organism survive or reproduce in a particular place (for example, camouflaged fur where there are predators, or thick fur where it is cold) will spread. If the environment changes, different traits can become helpful and grow more common.
3. Fossils show that life long ago looked different from life today. We find older fossils of species that no longer exist and fossils that look partly like old forms and partly like modern ones. This tells us species have changed over time instead of staying the same.
4. Comparing fossils in different rock layers tells us the order in which species appeared and how they changed. Deeper layers usually hold older fossils, and higher layers hold younger fossils. Scientists can also learn about past environments (for example, sea fossils found in places that are dry now) and see when new kinds of animals or plants showed up.
5. Transitional fossils are important because they show middle steps between major groups. They have traits of both the older group and the newer group, which helps us see how big changes happened little by little. Examples are fossils that link fish to land animals or dinosaurs to birds — they help map out evolutionary relationships.
2. The environment “picks” which traits are useful. Traits that help an organism survive or reproduce in a particular place (for example, camouflaged fur where there are predators, or thick fur where it is cold) will spread. If the environment changes, different traits can become helpful and grow more common.
3. Fossils show that life long ago looked different from life today. We find older fossils of species that no longer exist and fossils that look partly like old forms and partly like modern ones. This tells us species have changed over time instead of staying the same.
4. Comparing fossils in different rock layers tells us the order in which species appeared and how they changed. Deeper layers usually hold older fossils, and higher layers hold younger fossils. Scientists can also learn about past environments (for example, sea fossils found in places that are dry now) and see when new kinds of animals or plants showed up.
5. Transitional fossils are important because they show middle steps between major groups. They have traits of both the older group and the newer group, which helps us see how big changes happened little by little. Examples are fossils that link fish to land animals or dinosaurs to birds — they help map out evolutionary relationships.
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