Answer:
Dust bowl resulted from extreme drying and loosening of the soil that resulted in soil erosion by wind. Thus, it can be related that poor agricultural practices like over plowing , over grazing and leaving the land barren are human activities that must have contributed to the dust bowl.
Explanation:
- Dust bowl is referred to a period in early twentieth century when the the American and Canadian prairies faced severe dust storms.
- These dust storms resulted from severe drought and failure of practices to prevent soil erosion.
- Several people and livestock died as a result of choking.
- Over plowing, removal of top soil and small grasses exposed the soil to eroding winds and caused the dust storms.
Answer:
Both plant and animal cells have a nucleus, where DNA replication takes place. Both plant and animal cells have cell walls, which provide support for the cell. Both plant and animal cells have a large central vacuole, which stores enzymes, nutrients, and waste for the cell.
Explanation:
Answer:
The emergence of new species from surviving ancestral species and both species continue to interact during a transition period is known as Sympatric Speciation.
Explanation:
Hybrid Zone is the area where two species continue to interact. Hybrid offspring are produced by two different species.
1) hybrid offspring
2) zones
3) reinforces
4) zones
5) Slow down
6) gradual speciation model
7) punctuated equilibrium
