Describe a controlled experiment you could use to test your hypothesis

I guess the answer your looking for very much depends on your hypothesis.  A controlled experiment is experiment where a scientist (you/observer) tests their hypothesis by looking for changes occuring due to changing the variable.  For example if you were testing to find the best soil to grow tomatoes, you'd keep everything the same but you'd be changing the type soil. 

C- a hypothesis or d- an observation

Plants take energy from the sunlight with the of chlorophyll so the plant starts the food chain. then an herbivore eats the plant and gets its energy.then a carnivore or a human eats the herbivore and gets its energy. : )