California’s Santa Cruz mountains are in a ______ecosystem. They have hot, dry summers and mild, wet winter.

As the area have a hot, dry summers and mild, wet winter, its have a temperate forest ecosystem.
This Mountains Bioregion is an area that receives rainfall drainage off the mountain range.
Hence, because the area have a hot, dry summers and mild, wet winter, its have a temperate forest ecosystem.
Therefore, the Option D is correct.
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