The word evolution does not need to be capitalized.
No, coral does not need to be capitalized.
No, circa does not need to be capitalized.
No, it doesn't need to be capitalized.
No, kinetic energy doesn't need to be capitalized.
It is capitalized at the beginning of the sentence or when it forms part of the proper noun. Examples: The Pennsylvania Senate Minnesota Senate
YES! The State Senator is a very importantperson!
Usually! If you are referring to a particular group of legislators, (as you probably were), as in "the Senate passed a law yesterday" it is capitalized like a proper name. If you are referring conceptually to the upper house in any republican form of government, no capitalization.
The word evolution does not need to be capitalized.
No, coral does not need to be capitalized.
No. The capitalized version refers to the US Senate, a proper noun. When used with other nouns (Senate chamber, Senate hearings), it is a noun adjunct. A related adjective is senatorial.
No, circa does not need to be capitalized.
No, it shouldn't be capitalized.
No, it doesn't need to be capitalized.
No, kinetic energy doesn't need to be capitalized.
Occupations are not typically capitalized unless they are used as part of a title before a name (e.g., President Obama). Otherwise, they are usually written in lowercase (e.g., teacher, doctor).
Yes, the 'A' in AIDS should be capitalized as it stands for Acquired Immunodeficiency Syndrome.