题目选项分析

Hundreds of species of fish generate and discharge electric currents, in bursts or as steady electric fields around their bodies, using their power either to find and attack prey, to defend themselves, or also for communicating and navigating.

Hundreds of species of fish generate and discharge electric currents, in bursts or as steady electric fields around their bodies, using their power to find and attack prey, to defend themselves, or to communicate and navigate.