If you have a stamp in your passport showing that you were inspected and admitted, than the I-94 is not necessary. It's still important to make sure that you qualify to apply for the I-485 otherwise.
[This answer is for general purposes only; it does not constitute advice and does not establish an attorney-client relationship.]
No, assuming your entry can be verified with certainty by other means.
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The entry stamp in your passport is enough to establish that you entered the country legally. However, if your status has expired, you may not be eligible to adjust status, unless you are the spouse, parent or child of a U.S. citizen. You should consult with an immigration attorney to determine what avenue you should pursue to process your green card.
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Yes, you need to request the original I-94 evidence of your lawful entry by filing I-102 which may take up to three months.
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