e10.    Why do organisms become extinct?

Evidence indicates that there have been several periods of mass extinctions followed by periods of mass radiation, increasing the diversity of life. Climate, competition from other organisms, changing landforms, and even astronomical events could effect fauna and flora.

g04.    What causes climates to change?

g12.    How are mountains built?

g14.    How can global warming affect sea levels?

g15.    What are ozone holes and where are they?

g20.    What is the theory of plate tectonics?

m12.    Why are organisms becoming extinct?

m10.    What is the economic and medical importance of organisms?

m11.    What is the aesthetic and recreational importance of organisms?

m13.    What are endangered and threatened species?

m14.    What are some solutions for conservation and preservation?

m17.   What’s happening to the tropical forests?

m19.    What can be done to reduce the destruction of tropical forests?

m21.    Why is there controversy over old-growth deforestation?

m22.    How are energy resources used?

m28.    How is biomass used for energy?

m32.    How do ethics impact ecology?

m33.    How does global warming affect climate?

m34.    How could food production affect the environment?

m35.    How can global warming affect biodiversity?

m39.    How does ozone affect life?

m44.    Why are there detractors of pesticides?

m53.    How does air pollution affect organisms?

m55.    What are the environmental impacts of using up our mineral resources?

m59.    How do diapers affect the environment?

m60.    What impact do tires have on the environment?

m65.    What can cause biological hazards?

m67.    Are there problems with risk analysis?

m71.    What chemicals pose a danger?

m74.    How is soil important in the environment?

m78.    How do droughts and floods impact populations?