In the ocean, phytoplankton are most abundant in the

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The epipelagic zone, also known as the sunlit zone, is the uppermost layer of the ocean where sunlight can penetrate. This is the zone where phytoplankton, which require sunlight to perform photosynthesis, are most abundant. The other zones listed (abyssalpelagic, bathypelagic, and mesopelagic) are all deeper and receive very little or no sunlight, making it difficult for phytoplankton to thrive.

In the Ocean, Phytoplankton Are Most Abundant in the