Question

directions use a word or phrase from the box to complete the paragraph. fossils modification scientific theories hypotheses natural selection similar charles darwin traveled and studied 1. that formed in different times. older and newer rock layers held fossils that were 2. but somewhat changed over time. he observed plants and animals of the world in their habitats. he formed 3. about how and why populations change. lots of evidence supports his ideas so they are now called 4. the theory of descent with 5. says that newer species are related to and descended from earlier species. the theory of 6. explains that organisms that are best suited to their environment are more likely to survive and reproduce. directions tell how each pair of terms is alike. then tell how they are different. hypothesis/scientific theory 7. alike: 8. different: descent with modification/natural selection 9. alike: 10. different:

Explanation:

1. Darwin studied fossils.
2. Fossils in different layers are similar yet changed.
3. He formed hypotheses about population - change.
4. With evidence, they became scientific theories.
5. Descent with modification is about species - relatedness.
6. Natural selection is about survival - fitness.
7. Hypothesis and scientific theory are both ideas in science.
8. A hypothesis is untested, a scientific theory has much evidence.
9. Descent with modification and natural selection relate to evolution.
10. Descent with modification is about lineage, natural selection about survival - based reproduction.

Answer:

1. fossils
2. similar
3. hypotheses
4. scientific theories
5. modification
6. natural selection
7. Both are scientific ideas.
8. A hypothesis is untested; a scientific theory has substantial evidence.
9. Both relate to evolution of species.
10. Descent with modification focuses on lineage; natural selection on survival - based reproduction.