Answer:
“A lion may be helped by even a mouse.”
Step-by-step explanation:
The sentence “Even a mouse may help a lion” can be changed to the passive voice by making the object of the sentence the subject of the sentence.
The object of the sentence is “a lion,” so we can make it the subject of the sentence. We also need to change the verb to its past participle form, which is “helped.”
The passive voice sentence is: “A lion may be helped by even a mouse.”