Answer:
I am the key that is the hardest to turn
I am all around you, but you cannot see me. I have no throat, but you can hear me. Valued during summer but despised in the winter. What am I?
I am flora, not fauna. I am foliage, not trees. I am shrubbery, not grass. What am I?
I tell people to be careful when handling boxes.
I am partially baked. I am not completely lit. I am a portion of the moon. I am lesser than full wit. I am a divider of the hour. I am not a total lie. I am a sibling through one parent.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?