The ultimate source of energy that drives the food chain would be the sun. Without it, plants would be unable to make food for themselves using the sun, therefore causing plant eaters to have no food. Without the plant eaters, animals that eat the plant eaters would also have no food for themselves and so on.
Wordsworth said that poetry should try to keep the reader sensitive and forget what was going on in the real world and how everything was like basically falling apart.
