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1. Not photosynthetic bacteria.

1. Was a photosynthetic bacterium.

1. Photosynthetic bacteria with/in/by.

1. Photosynthetic bacteria; Photosynthetic bacterium

1. Not a photosynthetic bacterium.

1. Not photosynthetic bacteria.; It's not photosynthetic bacteria.

1. Was a photosynthetic bacterium.

1. Photosynthetic bacteria.

1. Not a photosynthetic bacterium.; Is not a photosynthetic bacterium.

1. Was not a photosynthetic bacterium.

1. Probably photosynthetic bacteria.

1. Was not a photosynthetic bacterium.; Was not a photosynthesizing bacteria.

1. Was not a photosynthetic bacterium.; Wasn't a photosynthetic bacterium.

1. Probably photosynthetic bacteria.

1. Was not a photosynthetic bacterium.; Was not a photosynthesizing bacteria.

1. If/when photosynthetic bacteria…; If photosynthetic bacteria were…

1. If photosynthetic bacteria; When photosynthetic bacteria

1. If/when photosynthetic bacteria