"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)
can somebody please help on this one i dont get it either
Answer:
what did the ocean say to the other ocean? Nothing they just WAVED, did ya SEA what I did there? I'm SHORE you did. God, you don't have to be so SALTY bout it...
yAy