- Green plants provide food for themselves / animals / consumers by performing photosynthesis
- A plant requires sunlight for photosynthesis
- Hence, plants require sunlight to provide food for themselves

- Plants require sunlight to provide food for themselves
- A plant / living thing requires food for survival
- So, plants requires sunlight for survival

- Sunlight is a kind of solar energy
- Solar energy is a kind of energy
- So, sunlight is a kind of energy

- Plants requires sunlight for survival
- Sunlight is a kind of energy
- Hence, plants require energy from sunlight for survival

- If a living thing requires something then that living thing must obtain that something
- To obtain something means to get somehting
- Therefore, if a living thing requires something then that living thing must get that something

- If a living thing requires something then that living thing must get that something
- A plant is a kind of living thing
- So, if a plant requires something then that plant must get that something

- Plants require energy from sunlight for survival
- If a plant requires something then that plant must get that something
- Therefore, a plant must get energy from sunlight for survival

- A plant must get energy from sunlight for survival
- Grass is a kind of green plant
- Hence, grass must get energy from sunlight for survival

Therefore, grass must get energy from sunlight for survival
Q: A goat gets energy from the grass it eats. Where does the grass get its energy?
Context:
- Sunlight is a kind of solar energy 
- A plant is a kind of living thing 
- If a living thing requires something then that living thing must obtain that something 
- Solar energy is a kind of energy 
- Green plants provide food for themselves / animals / consumers by performing photosynthesis 
- A plant / living thing requires food for survival 
- To obtain something means to get somehting 
- A plant requires sunlight for photosynthesis 
- Grass is a kind of green plant