Some regions of Iceland once were covered with forests. However, centuries ago humans logged the trees and grazed sheep on the logged regions, preventing natural regeneration.
This situation, in which one ecosystem has now been converted to another, represents A) a tipping point for this ecosystem with fewer ecosystem services than before.
B) the power of natural resilience mechanisms.
C) reverse ecological succession.
D) a sustainable approach to ecosystem management with a positive feedback loop.
Question 2
Which of the following natural threats to human health is least predictable, meaning that there is usually the least amount of lead time before a disaster?
A) Earthquakes, tsunamis, and tornados
B) Forest fires
C) Hurricanes and floods
D) Severe snowstorms
Prenatal development in humans.
Mitosis in humans
Striate Cortex and Regions of Extrastriate Cortex
Vertebral regions showing the four spinal curves.
Landform Regions
Body Regions in the Somatosensory Cortex