Evaluate the important of radioactive isotopes in determining the age of earth

If we can measure the half life of the oldest materials we can determine based on radioactive decay how old the objects are... hope it helps

Full change in the electric plus system

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