The home in the picture below is from a tsunami-prone area. Based on the results of your experiment, do you think the structure of this home would protect against tsunamis?

If the experiment was perfomed more then once and you get the same results

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. : )

Although i don't know what is the simulated system, starfish are predators that eat mostly  microalgae,  snails, sponges, bivalves, mussels and other small marine animals. removing starfish from any system would definitely increase this animals that they prey.