Some types of fish have specialized cells called electrocytes that generate an electric field around their body with which the fish can communicate with other individuals of the same species and can stun prey. Researchers noticed that electrocytes generated more current when blood levels of a hormone called ACTH were high. Which of the following hypotheses BEST reflects that observation?
A) Increasing levels of ACTH increase current production by electrocytes.
B) Current production by electrocytes is independent of ACTH levels.
C) Increasing levels of ACTH decrease current production by electrocytes.
D) Current production by electrocytes is dependent on ACTH levels.
Correct Answer:
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