Question

4 which statement identifies a limitation to the model that engineers used to claim that fishways would allow thousands of fish to bypass the dams each year? hide all a the height of the fish lift in a fishway b the number of gates fish need to pass through in a fishway c the amount of time it takes a fish to safely pass through the fishway d the number of fish attracted could be less than the maximum number for that fishway

Explanation:

To determine the limitation of the model engineers used for fishways, we analyze each option:

• Option A: The height of the fish lift relates to the physical design but doesn't directly limit the number of fish bypassing (the model's claim about thousands of fish).
• Option B: The number of gates affects passage difficulty but not the core claim about the number of fish attracted/bypassing.
• Option C: Time for a fish to pass doesn't limit the total number of fish bypassing annually as per the model's claim.
• Option D: If the number of fish attracted is less than the fishway's maximum capacity, the model's claim of thousands bypassing is limited because the actual number attracted (and thus bypassing) could be lower. This directly challenges the model's assumption about the number of fish using the fishway.

Answer:

D. the number of fish attracted could be less than the maximum number for that fishway