1588029
Description
Flashcards by sammibeard, updated more than 1 year ago
|
Created by sammibeard
over 9 years ago
|
|
| Question | Answer |
| When was the Archreon era? | 3800bc or 5600 mya |
| What does Archron mean? (extra info) | It means ancient, referring to the oldest rocks known. |
| What did the Archeon era provide to allow the first lifeforms to be created? | Volcanic gases (N, H2, C and O2) with an abundance of H2O (ocean). These caused chemical reactions to create life. |
| What were the first lifeforms on the earth? | Simple single celled organisms (prokaryotes) |
| What was the era called that started around 2500 bc (or 2100/ 2400 mya)? | Proterozic |
| What does Proterozic mean? (extra info) | Means first life |
| Where were the rocks from this era found? (extra info) | Canada, china and Australia |
| What allowed life in the Proterozic era to become more diverse? | Erosion caused sediment to wash into marine environments, creating shallow water. This gave organisms access to more air, allowing them to evolve into more diverse multicellular organisms. |
| What sort of organisms can be found in the Proterozic era? | Eukaryotic organisms (multicellular) |
| When was the Phanerozonic era? | 540bc or 600 mya |
| What sort of organisms were found in the Phanerozonic era? | Multicellular soft bodied organisms. |
| What was significant about the Phanerozonic era? | There were visible life signs and was therefore divided into three different groups on the basis of characteristic assemblages of life forms. |
| What are the three groups in the Phanerozonic era? | Paleozoic (542 mya - 251 mya), Mesozic (251 mya - 65.5 mya) and Cenozonic 65.5 mya to now) |
| In the Phanerozonic era, what species developed within this era? What was the effect of this development on the earth? | Plants! They produced a vast about of oxygen into the atmosphere through photosynthetic processes. |
| What are prokaryotes? | Any organism where the genetic material is not enclosed with in a cell nucleus. Consists exclusively of bacteria. |
| What are Eukaryotes? | An organism that consists of cells (many) in which the genetic material is contained within distinct nucleus, minus bacteria, all organisms are eukaryotes. |
| What are the three periods that divided the Early Palaeozonic stage? | Cambrian, Ordovician and Silurian. |
| What are the three periods that divided the Late Palaeozonic? | Devonian, Carboniferous and Dermian. |
| What are the three periods that divided the Mesozonic? | Triassic, Jurassic and Cretaceous. |
| What are the three periods that divided the Cenozoic? | Palaeogene, Neogene and Quaternary. |
| What percentage of rocks can preserve fossils? | 15% |
| What percentage of fossils are aquatic? | 95% |
| What is the ratio of species that have been fossilised. | 1:10000 |
| What kind of animal did the Cambrian era contain? | Complex invertebrate |
| What is the Cambrian explosion? | the relatively short evolutionary event, beginning around 542 million years ago in the Cambrian Period, during which most major animal phyla appeared, as indicated by the fossil record. |
| During the Cambrian explosion, what was evolved? | Chordates evolved during this time, developing dorsal nerve cords, hard-bodied brachiopods, arthropods (ancestors of spiders, insects and crustuceans) |
| What type of plants could be found in the Cambrian era? | Single celled algae, but grows together to form massive colonises. |
| What happened at the end of the Cambrian period? | There was a mass extinction, advancing glaciers lowered the temperature as well as the O2 levels. Organisms had no time to adapt. |
Want to create your own Flashcards for free with GoConqr? Learn more.