BI SC 002 Lecture Notes - Lecture 59: Habitat Destruction
Document Summary
Life has existed on earth for: 3 billion years. We depend on a huge number of other organisms for: food, shelter, warmth, compounds that cure disease. There are more bacterial cells in human bodies than: Help us fully digest food in our intestines: absorb nutrients we need. Plants purify air by: absorbing carbon dioxide, producing oxygen. Animals that no longer exist: provide energy in the norm of fossil fuels. Despite level of which we rely on other species: human activities harmful to biodiversity, earth is in midst of a biodiversity crisis . Other organisms: estimated that rate of extinction sped up: 100 to 1000 times ever since humans intervened. Level is comparable to the rate during: Biggest thread to biodiversity: 5 mass extinctions, habitat destruction, humans have altered almost of the land. Forced to find a new home: another problem:
