With reference to food chains in ecosystems, consider the following statements :
1. A food chain illustrates the order in which a chain of organisms feed upon each other.
2. Food chains are found within the populations of a species.
3. A food chain illustrates the numbers of each organism which are eaten by others.
Which of the statements given above is / are correct?
- 1 only
- 1 and 2 only
- 1, 2 and 3
- None