It depends on whether you want the possessive form of porcupine (singular) or porcupines (plural) because there is a difference.
1. singular porcupine: just add an apostrophe followed by -s: porcupine's
2. plural porcupines: just add an apostrophe (not followed by -s): porcupines'
Mrs. Mallard actually starts to feel better in her room
I have many goals in life, some may view them as over ambitious, however I believe they are perfect.
The puritans were a strong religious group like the Catholics so a logical answer is religion<span />
Answer:
When Simon comes back tonight he will cook dinner.
Explanation:
Grammar