When geologists refer to the "big five," what are they referring to?
the five most important organisms that have become extinct.
the five largest mass extinctions in earth's history.
the five most influential events that have changed the surface of the earth.
the five most important inventions that have allowed scientists to study mass extinctions.

The "Big Five" refers to the five largest mass extinctions in Earth's history.

Iread this book last year so take this with a grain of salt.gene jumps from the tree to compete with finny due to the fact that gene is always trying to do better than finny. he is put under the grasp of peer pressure due to finny almost forcing him to do this. ever since he first jumped finny kept pressuring him to jump since he thought gene enjoyed jumping.rather than uses this answer you should probably just reread chapters 3-4

Apossible long term health effects of stress would be work