Officially two words, but consider "afterwhich" an acceptable misspelling.
2 words
Animals eat the apples and then move around, afterwhich they poop the seed out.
Animals eat the apples and then move around, afterwhich they poop the seed out.
It should be 2 words.
2
Into is 1 word.
Green Day is 2 words.
I is 2 words. SPRAY-BUTTER
Two words.
1
No, one thing can be 1 or 2 words e.g NERVE_CELL. 2 words, 1 thing.
-1/2 or 1/-2 but most commonly -(1/2) (They all are the same)