You would only capitalize pelican if it was at the beginning of the sentence. Pelican is not a proper noun, so it would not be capitalized.
No, it shouldn't be capitalized.
No it shouldn't be capitalized.
No!
No it shouldn't be capitalized.
Yes it should be capitalized.
Yes, days of the week are capitalized.
Well, as a common noun it does not need to be capitalized as for it used in this sentence, " I'd like to give you a wedding at my house." but if used as a proper noun it does need to be capitalized. " I loved the Wedding."
Yes, "Biology" should be capitalized because it is a proper noun and the name of a specific scientific discipline.
No.
No.
No it does not need to be.
No, you do not need to capitalise mile in a sentence.