1. Enzymes and their substrates are described as having a lock-and-key fit. Why is it important that they have such a specific fit? 2. Global warming has occurred because of the large amounts of...

1. Enzymes and their substrates are described as having a lock-and-key fit. Why is it important that they have such a specific fit?

2. Global warming has occurred because of the large amounts of carbon dioxide released by the burning of fossil fuels. Carbon dioxide traps heat. Why might the loss of forests also contribute to global warming?