Jane uproots a beetroot plant from the soil. she observes that the edible bulb of the plant is located beneath the soil, and the leaves are located above the ground. which vascular tissue in the growth of the underground vegetable?

I think the correct answer would be phloem. The vascular tissue that helps in the growth of the underground vegetable is the phloem. It is the tissue in a plant that conducts sugars and other products downward from the leaves.

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.