Question

question 25(multiple choice worth 4 points)
(04.02 mc)
cyanobacteria are photosynthetic marine organisms. why would these organisms likely be found only in shallow ocean zones?
the current in deeper ocean zones is too traumatic.
the amount of oxygen in deeper ocean zones is too high.
the amount of light in deeper ocean zones is too dim.
the amount of pressure in deeper ocean zones is too low.

Explanation:

Cyanobacteria are photosynthetic, meaning they need light for photosynthesis. In deeper ocean zones, light is dim. Current isn't the main factor for their photosynthesis. Oxygen levels in deeper zones are not too high (in fact, some deep - sea areas can be oxygen - minimum zones). Pressure in deeper zones is high, not low.

Answer:

The amount of light in deeper ocean zones is too dim.