In a food web, energy decreases as it moves up trophic levels. Plants (like grass) are at the base of the food web and are primary producers, meaning they have the most energy since they convert sunlight into food through photosynthesis.
In the given path of the food web (plants → mouse → rabbit → owl), the energy flow is as follows:
- Plants (grass): Most energy (producers)
- Mouse: Energy from plants (primary consumer)
- Rabbit: Energy from plants (also a primary consumer, but typically at a different feeding level)
- Owl: Least energy (secondary consumer)
Thus, among the options provided (rabbits, grass, owl, mouse), grass has the most energy.