which scientist first told about possibility of life on mars and what evidences did he gave for the same

Dear Student,

Please find below the link of a similar query as asked by you: 

https://www.meritnation.com/ask-answer/question/some-scientists-claim-that-there-was-life-on-mars-is-it-rea/stars-and-the-solar-system/7737441

https://www.meritnation.com/ask-answer/question/how-did-the-scientists-suspected-hat-there-may-be-life-on-ma/science/9076603

https://www.meritnation.com/ask-answer/question/why-scientist-predicte-exestince-of-life-on-mars/stars-and-the-solar-system/6897414

We hope the above link will help you in clearing the doubt.

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