I need help with number 3

Answer:
put the comma on hand, as it will make the most sense.
Explanation:
as putting a comma any where else would not make sense, hand would be the most logical.
Answer:
A bird perched on my hand, but he didn't stay for long.
Explanation:
Use a comma before a connecting word like "for," "and," "nor," "but," "or," "yet so," or "nor."