Answer:
24
Explanation:
The number of possible ways to combine each of the growth factors is 24.
There are 4 options for lighting, 2 options for temperature, and 3 options for humidity. So, there are 4 * 2 * 3 = 24 possible combinations.
Another way to think about it is that we can choose one of the four lighting options, one of the two temperature options, and one of the three humidity options. This gives us a total of 4 * 2 * 3 = 24 possible combinations.
Therefore, the answer is 24