Yes, when it is a proper noun -- the name of a Roman god, a planet, a city in Florida, and an early US missile system. There is currently no common noun for "jupiter."
Yes, "Jupiter" should be capitalized in a sentence as it is a proper noun referring to the planet in our solar system.
Yes, "Geology" and "Science" should be capitalized in a sentence because they are proper nouns.
No, the word "century" is not capitalized unless it begins a sentence. So "thirteenth century" would not be capitalized in the middle of a sentence.
No, "pigeon" is not typically capitalized in a sentence unless it is part of a proper noun or at the beginning of a sentence.
No, "sister" is not capitalized in the middle of a sentence unless it is used as part of the name or title that is capitalized. For example, in "I have a younger sister," "sister" would not be capitalized.
Yes, Chevrolet should be capitalized in a sentence as it is a proper noun.
The word "sun" is not usually capitalized in a sentence. The exception is if it is used in context with other planets that are being capitalized in the sentence. Ex: "Jupiter is closer to the Sun than Neptune."
They are not proper nouns. They would not be capitalized in a sentence.
Yes, "Geology" and "Science" should be capitalized in a sentence because they are proper nouns.
No it shouldn't be capitalized.
Yes, Siamese would be capitalized.
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.
yes
No, "pigeon" is not typically capitalized in a sentence unless it is part of a proper noun or at the beginning of a sentence.
No. It is only if it is at the start of a sentence that it would be.
No. It is not capitalized unless it is part of a formal name.
No, colors are not typically capitalized unless they are part of a proper noun or title. For example, "red car" would not be capitalized, but "Red Cross" would be capitalized.
People do not capitalize "a" in a sentence because it is not a proper noun. There is no other reason why "a" would be capitalized. If you are talking about getting an A on an assignment, however, it would be capitalized.