Cells can regulate what they need or don't need to maintain their own health. true

Yes. With the help of every individual organelle in the cell's body, a cell can keep itself alive. For example, they can use cellular respiration to create ATP. 

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. : )