Multiple choice

Which open sea vertical zone contains phytoplankton and high O2 levels?

  1. abyssal

  2. euphotic

  3. bathyl

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The euphotic zone is the upper layer of the ocean where sunlight penetrates, allowing for photosynthesis, which produces oxygen and supports phytoplankton.

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