Generally, no, but if it's part of a proper name, then yes, it will be capitalized.
Have should be capitalized if it is the beginning of a sentence. Summer should not be capitalized.
It should only be capitalized if it forms part of a title.
Yes it should be capitalized.
As an abbreviation it should be capitalized.
Yes it should always be capitalized.
Nope, unless you want it to, or it's in a title.
Protein should not be capitalized unless it is at the start of a sentence or part of a proper noun or title. For example, "I ate chicken for dinner. It is a good source of protein."
Typically, mother-in-law is not capitalized. The only time I can think of would first make it plural, such as:Mothers-in-law are often the butt of cruel jokes.Mothers-in-law in the city were honored at a dinner.
Have should be capitalized if it is the beginning of a sentence. Summer should not be capitalized.
Yes, "Local Park" should be capitalized because it is a proper noun.
Yes, "Osprey" should be capitalized because it is the proper name of a specific bird species.
It should only be capitalized if it forms part of a title.
Yes, it should be capitalized.
Yes it should always be capitalized.
Yes it should be capitalized.
As an abbreviation it should be capitalized.
The first 'c' should be capitalized.