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14.2 and 15.3
| Question | Answer |
|---|---|
| What is a fossil? | Preserved remains of markings left by organisms that lived in the past. |
| What is the fossil record? | A chronological collection of life's remains in the rock layers, recorded during the passage of time. |
| Basilosaurus fossils suggest that...? | They were one of the earliest whales, and are the reason why whales are they way they are now, the fact that they don't use their legs to support their weight. |
| What is geographic distribution? | All started when Darwin made his voyage and suggested that today's organisms evolved from ancestral forms. |
| What are homologous structures? | Similar structures in species sharing a common ancestor. |
| What are vestigial structures? | Remnants of structures that may have had important functions in an ancestral species, but have no clear function in some of the modern descendants. |
| What are similarities in development (embryological evidence)? | When Embryos of closely related organisms often have similar stages in development. Embryos of closely related organisms often have similar stages in development. |
| What is DNA sequences and molecular evidence? | DNA sequences are passed from parent to offspring and determine what amino acids our bodies need, and help scientists discover that DNA sequences are a form of evolution. |
| How do fossils form? | Under right conditions, minerals dissolved in ground water seep into the tissues of a dead organism and replace its organic material. Teeth or bones are preserved by chemical changes, while plants as well as animals become petrified and turn to stone. |
| What is the geological time scale? | Helps organizes earth's history into 4 distinct ages known as the precambrian, paleozoic, mesozoic, and cenozoic. |
| What are relative dating of fossils? | Usually the ones on the top are younger fossils while the older ones are below it. It won't always tell you age of fossils or what time period. |
| What is radiometric dating of fossils (and half life)? | Based on the measurement of certain radioactive isotopes in objects. |
| What is continental drift (and Pangaea)? | When landmasses on different plates change position relative to each other as a result of movement. What the earth used to be, all the continents were 1 big continent then they split. |
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bricua1
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