which of the following is not a constant?
a. plant height
b. types of beans
c. amount of fertilizer
d. hours of sun exposure
![which of the following is not a constant a plant height b types of beans c amount of fertilizer d hours of sun exposure class=](https://us-static.z-dn.net/files/de1/c89e273d77c7a1d286fcc2d5207f00af.png)