Positrons: A. have a positive charge
B. are similar to electrons
C. were discovered by Carl Anderson
D. all of the above
E. none of the above

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.

The answer would be generation

People with hemophilia lack a vital clotting protein in their blood. without this protein, their blood takes longer to clot and they may bleed to death, based upon the severity of their case.