According to the professor, what are the possible means used by migrating whales to find t

According to the professor, what are the possible means used by migrating whales to find the right direction？ Choose 3 answers.

A．Using magnetic fields as a guide

B．Recognizing coastal landmarks

C．Following the heat of the tropical water

D．Listening to sounds that bounce off of the land

E．Following the migrating plankton

此题为多项选择题。请帮忙给出正确答案和分析，谢谢！