Answer:
Depends on how much you want to learn really, schools usually just make you learn all sorts of parts of the subject. Some that could be necessities and some that you would rarely use.
Explanation:
They’re is no answer choices provided.
I am assuming that horses' is plural.
----------------------------------------------------
If it were singular, it would be horse's.
----------------------------------------------------
Sinces is it written s',it is plural.
hey hi how r u doing ??????