The distance between earth and the moon is about 384,100 km distance can be written in scientific notation is 8×10 to the power of the kilometers were a equals blank and b = blank

Bhope this : )

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.