The following sulphide salts forms white crystals except

Explanation

Ecosystems have biotic (living) and abiotic (non-living) components. Biotic: producers, consumers, decomposers. Abiotic: sunlight, temperature, water, soil, air, minerals.

Biotic interactions: predation (predator-prey), competition (same resources), symbiosis (mutualism, parasitism, commensalism). Abiotic factors determine which organisms can survive in an area.

Energy flows one direction (sun → producers → consumers → decomposers). Nutrients cycle between biotic and abiotic components. Both flows are essential for ecosystem function.