ANSWER: This is not a reliable site to take Islamic knowledge from. Refer to https://islamqa.info/en for authentic Islamic knowledge. Touching the ears during takbeer is not permissible as it’s an innovation.

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ANSWER: These are two separate things! You’re sinful for not removing the pubic hair but this has no impact on your prayers. 

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ANSWER: No problem as praying with the congregation is not mandatory upon you but you would be losing a great deal of rewards.

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ANSWER: If you skip it intentionally then your prayer is not valid as it is mandatory to say.

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ANSWER: The sunnah is to repeat after a live athaan and say the dua after hearing it. If you can’t hear it, you shouldn’t say the duaa. If you are a male, you can call the athan yourself and say the duaa. 

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