Alienation and loneliness?
Answer:
It contains a comma splice.
Explanation:
"Don't stack twelve boxes on top of one another" and "it's the twelfth one that will knock down the pile" are independent clauses and should be linked by a colon, semicolon, or conjunction.
Answer: Two different sentences that represent a viewpoint that is in opposition to the writer’s position:
1) One of the most commonly cited benefits of having pets in school is they help calm students and improve their overall health.
2) Supporters of having pets in schools also claim that contact with pets will improve learning by reducing children’s anxiety.