19.9: History of Life on Earth- Challenge
- Page ID
- 6057
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- 1. Prokaryotes do not have ___.
- membrane-bound organelles or a nucleus
- 2. Photosynthesis allowed for the proliferation of life because ___.
- organisms no longer had to rely on nutrients floating by for food
- 3. ___ are reef-like structures in which colonies of cyanobacteria lived.
- Stromatolites
- 4. The first humans evolved ___ years ago.
- 0.2 million
- 5. We are currently living in the ___ era.
- Cenozoic
- 6. The dinosaurs lived in the ___ era.
- Mesozoic
- 7. Most of the fossil fuels we burn today originated from ___swamps, dominated by ___ plants.
- Carboniferous; seed-bearing
- 8. The largest increase in the number and diversity of living things on Earth was the ___ at the beginning of the ___ era.
- Cambrian Explosion; Paleozoic
- 9. Simple plants lacking vascular tissue, like mosses, began to colonize land during the ___ period.
- Ordovician
- 10. Homo erectus developed the first ___.
- cultures
- 11. Cultures with control of fire, use of tools, and hunting strategies began to evolve with the appearance of the species ___.
- Homo erectus
- 12. Species of the genus Ardipithecus lived in ___.
- trees
- 13. Phanerozoic means ___.
- visible life
- 14. The Quaternary Period marks the time since ___.
- the beginning of the ice ages
- 15. "The Recent" is another name for the ___.
- Holocene