Erosion can result in a vicious cycle of worsening erosion because
A) rainwater increasingly soaks into the ground.
B) the accumulation of humus makes erosion more likely.
C) plants are less likely to grow in an eroded region.
D) the pH of the soil increases as erosion continues.
Question 2
Consider a comparison of people living well in densely populated cities versus people living well in less dense suburbs. For the people living in the cities, it is
A) less expensive to provide social services and utilities but costs more to control crime and pollution.
B) less expensive to provide social services and control crime and pollution.
C) more expensive to provide social services and utilities and to control crime and pollution.
D) more expensive to provide social services and utilities but less to control crime and pollution.
The sexual cycle of flowering plants involves alternation of sporophyte and gametophyte generations.
Life Cycle of Lobster
Menstrual cycle
Life cycle of Giardia.
The Hydrologic Cycle
HIV Infection Cycle