I Need Clarification Of A Specific Part Of Placed_Features 1.20.1

json { "feature": "minecraft:ore_copper_small", "placement": [ { "type": "minecraft:count", "count": 20 }, { "type": "minecraft:in_square" }, { "type": "minecraft:height_range", "height": { "type": "minecraft:trapezoid", "max_inclusive": { "absolute": 112 }, "min_inclusive": { "absolute": -16 } } }, { "type": "minecraft:biome" } ] } What is this section? json { "type": "minecraft:biome" } And what value is it specifically checking?