Question

a characteristic of the open - loop system is that it does not use feedback to determine if its output has achieved the desired goal of the input.this means that the system does not observe the output of the processes that it is controlling. closed - loop systems employ feedback and a reference of correctness. deviations from the norm are detected and corrections made in order to maintain a desired output.what is not an example of a closed loop system?a food webb iv remotec thermostatd sky oven

Explanation:

The question asks for what is NOT a closed-loop system. Closed-loop systems use feedback to monitor output and adjust inputs, while open-loop systems do not. Food webs (A) are ecological systems where energy flow and population dynamics involve feedback (e.g., predator-prey cycles adjusting based on population changes). Thermostats (B) are classic closed-loop systems (monitor temperature, adjust heating/cooling). Refrigerators (C) use feedback to maintain internal temperature. An open-loop system does not use feedback, so the answer is the option representing an open-loop system (assuming the missing option D is an open-loop example, but based on standard questions, if the options include an open-loop device like a toaster or simple switch, that would be the answer—though given the context, the correct answer here is the one that lacks feedback).

Answer:

(Note: The image's option D text is unclear, but based on standard closed-loop vs open-loop questions, the answer is typically the open-loop system. If D is an open-loop example like a "simple light switch" or "toaster", then D is the answer. Assuming the options are as implied, the answer is D.)
D. (Assumed open-loop system, e.g., open-loop device without feedback)