Which layer in the Yellowstone core sample contains cyanobacteria?

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Multiple Choice

Which layer in the Yellowstone core sample contains cyanobacteria?

Explanation:
Cyanobacteria are photosynthetic, so they must have light to grow. In a core sample, light only reaches the uppermost portion, making that surface layer the place where photosynthetic organisms would live. The greenish appearance of the top layer indicates chlorophyll-bearing organisms like cyanobacteria, so that is where they would be found. Deeper layers lack sufficient light, so cyanobacteria wouldn’t thrive there. The outer crust describes the rock’s exterior, not a distinct interior layer, and wouldn’t be the primary habitat inside the core.

Cyanobacteria are photosynthetic, so they must have light to grow. In a core sample, light only reaches the uppermost portion, making that surface layer the place where photosynthetic organisms would live. The greenish appearance of the top layer indicates chlorophyll-bearing organisms like cyanobacteria, so that is where they would be found. Deeper layers lack sufficient light, so cyanobacteria wouldn’t thrive there. The outer crust describes the rock’s exterior, not a distinct interior layer, and wouldn’t be the primary habitat inside the core.

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