Hello!
The difference between <em>tone</em> and <em>mood </em>is:
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Tone:
Tone is what the <em>author </em>feels about what s/he is writing. It reflects the writer's feelings.
Mood:
Mood is what the <em>reader </em>feels about what s/he is reading. It is intended to shape the reader's emotional response to the literary work.
<em>Sometimes </em>the mood and tone can be the same. This isn't always the case, though.
"The space shuttles is the subject."
Simple formula: find the verb of the sentence then ask the question "who or what performs the verb" and the answer to that question is the SUBJECT of that sentence!
In your sentence; ask the question;
"Who or what have made travel to the International space station convenient and possible?
Answer: The space shuttles (that's your subject)
C. Writing can be too casual and spontaneous.
........Bruh it's the wind....you answered your own question <span />