What might be one potential solution for eliminating the crown-of-thorns starfish from the Great Barrier Reef? introducing a predator to eat the starfish
eliminating their food supply to starve them
introducing a different species that outcompetes them
hunting or culling by humans

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.