1. ans: It is generated from source of layers , migrates upward by displacing water and is trapped by overlying layers that will not allow hydrocarbons to further upwards .
The most logical contributing factor for the endangered status of black-footed ferret is Human encroachment. Farmers and ranchers (with government assistance) eliminated many prairie dogs because their underground complexes were destructive to fields. This led to decrease in the prairie dog populations, the primary prey of black-footed ferret.
Vacuoles store the materials needed for the cell.
Investigate-make observation and reseach your topic of interest.Ex: library, internet, textbooks, ask someone.