Answer the following question given this paragraph: 

Heat and light are forms of energy. Other forms are chemical and electrical energy. Energy can’t be created or destroyed. It can change form. For example, a piece of wood has chemical energy stored in its molecules. When the wood burns, the chemical energy changes to heat and light energy.


Q: How do plants support themselves above the ground to get light and oxygen?

 Choices:

- momentum

- flaccid stems

- symbiosis

- stiff stems

A:
stiff stems
