What is the branch of earth science that puts past events on earth in order by time?
A) geology
B) geography
C) ecology
D) chronology

1. in what ways have non-native species been beneficial? 2. what are some of the hypotheses for the collapse of honeybee colonies? 3. distinguish between regional and functional extinction. 4. why is it difficult to measure background extinction rates? 5. what three factors are most important in causing extinction rates to climb?