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chapter 6 studyguide
| Question | Answer |
|---|---|
| What must happen before a group of organisms can be called a species? | They have to be able to mate and reproduce. |
| How do scientists determine the actual age of fossils? | Radioactive Dating |
| What process is used to determine if one fossil is older than the other? | Relative Dating |
| What is the term that refers to similar structures that related species have inherited from a common ancestor? | Homologous Structure |
| Which term refers to the process by which individuals that are better adapted to their environment are more likely to survive and reproduce? | Natural Selection |
| Why do scientists believe that whales once walked on land? | Because fossils show they had legs. |
| What process is it when two organisms look very similar during their early stages of development? | Similarities in development |
| What 5 types of evidence do scientists combine to determine the evolutionary relationships among species? | 1. fossils 2. similarities in early development 3. similarities in body structure 4. DNA similarities 5. Combining evidence |
| What did Darwin observe about finches in the Galapagos Islands? | They have beaks made for food they eat. |
| How does natural selection lead to evolution? | Better adapted ones will survive, others will die. |
| What are fossils? | Preserved remains of organisms that lived in the past. |
| What are adaptations and why are they important in explaining evolution? | Adaptations are traits that help organisms survive and reproduce. We know that some species died and changed (adapted) to survive. |
| Under what circumstances might a new species form? | When divided from same species and reproduce with other species for generations. |
| What is formed when minerals replace bone? | Petrified fossils |
| What is extinction and how do fossil records help us to understand it? | Extinction is when a species dies out. Fossil records help us know when it died out. |
| What types of comparison are the forelimbs of a bird and a mammal? | Homologous structure |
| What do similarities in the early development of chickens and opossums suggest? | We once had a common ancestor |
| What is the diagram called that allows scientists to show how groups of organisms may be related? | Branching Tree |
| What word is changes in a species over time? | evolution |
| What are variations among species also called? | differences |
| How did studying selective breeding help Darwin develop his theory of evolution? | He knew that in selective breeding your choosing traits and those traits are the ones that survive. |
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22emorrisroe
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