Final Exam Flashcards
Biological conservation
Stewardship of the natural world
Resource conservation
Sustainable use of renewable natural resources
How have humans affected biodiversity?
We have caused a global biodiversity crisis, destroying biodiversity at a catastrophic rate.
What is coffee associated with?
Destruction of tropical evergreen forest
Is extinction bad?
Yes and no because it’s been a a part of natural biological change.
How many species have gone extinct?
Most species that have ever evolved are now extinct (99 percent).
Mass extinction
Events when large number of species go extinct simultaneously
How many mass extinction periods are there?
Six
When was Earth formed?
4550 Ma
What was the first sign of life of Earth? When?
Prokaryotes at 4 million years ago.
When do first eukaryotes occur?
2 million years ago.
When did multicellular organisms occur?
1-2 million years ago
When did the extinct events occur?
541 Ma to now.
When were humans first on Earth?
2 Ma
What happened in the first extinction? Why?
25% of marine families go extinct because of global cooling.