- Plant is a kind of oragnism
- A lemon tree is a kind of plant
- Therefore, a lemon tree is a kind of organism

- A lemon tree is a kind of organism
- Cold temperatures usually have a negative impact on organisms
- Therefore, cold temperatures have a negative impact on the lemon trees

- Cold temperatures have a negative impact on the lemon trees
- A greenhouse is used to protect plants by keeping them warm
- A lemon tree is a kind of plant
- Hence, a greenhouse can be used to protect the lemon trees by keeping them warm

Therefore, a greenhouse can be used to protect the lemon trees by keeping them warm
Students want to plant a lemon tree at their school, but the cold winter temperatures in Massachusetts would kill the tree. Which of the following is the best solution to this problem?
- Cold temperatures usually have a negative impact on organisms 
- A greenhouse is used to protect plants by keeping them warm 
- Plant is a kind of oragnism 
- A lemon tree is a kind of plant