Apea plant with round seeds (rr) is crossbred with another pea plant with wrinkled seeds (rr). what is the probability of the offspring having wrinkled seeds? 0% 25% 50% 75%

0% because the wrinkled seed alleles (rr) are recessive.

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.