Explanation
- A
Fresh water
(a) Fresh water. Freshwater biomes (lakes, rivers, wetlands) are aquatic natural classes, not the anthropogenic type asked.
- B
Grassland
(b) Grassland. Grassland is a classical terrestrial biome (prairie, savanna, steppe), not defined as human-made here.
- C
Rain forest
(c) Rain forest. Rain forest is a climate-vegetation biome, not an anthrome.
- D
Cropland
(d) Cropland. Cropland is an anthropogenic biome (anthrome): human agriculture replaces the original cover. Ellis and Ramankutty map croplands, villages and urban as human biomes. That stored example is the official key.
Summary. Official key is (d) Cropland. Anthropogenic biomes are human-shaped; cropland is the listed example. Fresh water, grassland and rain forest are conventional natural biomes. Neighbouring anthromes are rangeland, villages and dense settlements. Honour cropland.
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