Please helppppp im really tired. U can do anyone you want and if u can do more then one it would be really helpful
![Please helppppp im really tired U can do anyone you want and if u can do more then one it would be really helpful class=](https://us-static.z-dn.net/files/dfb/3a4fab440f543b3f639517fd55ec18d2.jpg)
Answer:
3. B
4. D - if its plant growth cause I cant see it
Explanation:
the controlled variable you should be able to control 8n which b is the only option and d. the growth of the plant is dependant on the sunlight.
hope this helps sry if I'm wrong