Final answer:
The landscape contour that is an indicator of a subtropical desert biome is low annual precipitation with little monthly variation and lack of predictability in rainfall. Subtropical deserts have hot daily temperatures and limited dry-adapted vegetation.
Step-by-step explanation:
The landscape contour that is an indicator of a subtropical desert biome is low annual precipitation with little monthly variation and lack of predictability in rainfall. Subtropical deserts are characterized by hot daily temperatures and can have nighttime temperatures approaching freezing. The vegetation in subtropical deserts is typically limited to dry-adapted species like cacti and hardy shrubs.