Question #d00bf

It is asking you to identify one of the independent variables.

Explanation:

Process $\to$ photosynthesis

Independent variables: the scientist has control over this variable, can manipulate it; it's the cause of the dependent v.

• reactants:
e.g: -water given to the plant

Dependent variables: what is observed or measured, the effect or consequence.

• height
• gas (oxygen) produced

( Control variable: constant variable, does not interfere with the results)

• light
• soil quality
• time
• plant species