Final answer:
Frogs are the organism most likely to be affected by increased turbidity due to their reliance on taste or chemical cues to find food in slow-moving and murky waters.
Step-by-step explanation:
The organism that is MOST likely to be affected by increased turbidity is frogs.
Frogs are higher order predator vertebrates (phylum Chordata) which must find food in slow-moving and sometimes murky waters. Unlike trout, these vertebrates rely less on vision and are more likely to use taste or chemical cues to find prey.
Increased turbidity, caused by sedimentation and suspended phytoplankton, reduces water clarity and makes it harder for frogs to locate their food.