Mutual efforts are the key to success.
An effort by one person is the key to success.
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Efforts = plural. Use "are".
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You could say either:
"Mutual efforts are the key to success".
OR
"Mutual effort is the key to success".
Efforts are... (plural)
Effort is... (singular)
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I am the key
You are the key
He/she/it is the key
We are the key
You are the key
Theye are the key
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