The teacher illustrated the flow of energy in this food chain:
Grass → Beetle → Frog → Snake → Hawk
If there's 7 kilojoules (KJ) of energy at the fourth level (where the snake is), how much energy exists at the beginning of the chain (with the grass)?
1
70000 KJ
2
7000 KJ
3
700 KJ
4
70 KJ