Talk to the students about what the foodchain is and why it is so important to survival and to keep animal and plant populations under control. Some examples of this are whale hunting for their blubber. Dolphins getting trapped and killed in fish nets for tuna, Seals pups being killed for their fur and oil spills killing many different animals in the oceans and plant life that takes years to grow back the way it was. And due to the oil spills the thousands of animals that are killed. Also pollution on beaches that gets in the ocean that many animals swallow and are killed.
Examples are pop bottles and paper products.