Crops are protected from disease-causing fungi by use of fungicides or by the use of genetically engineered fungi-resistant crops. Compare and contrast the two methods used to protect crops from fungi. Which statement BEST describes how the two techniques differ in reducing fungal infestations of crop plants?

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?