Answer: 1. As the food source disappears, the animals and residents of the environment will be forced to find new food sources. They may also have to migrate away to a place where that food source is plentiful.
2. A sudden danger, will first cause an organism to escape their current environment or habitat, to seek a place where that danger doesn't exists. They may may also use natural defense mechanisms to fend off the danger.
Explanation: hope this helps