Answer:
A vacuum breaker is an attachment commonly placed on a bibcock valve or toilet or urinal flush valve, that prevents water from being siphoned backward into the public drinking water system. This prevents contamination should the public drinking water system's pressure drop.
Explanation:
<span>Ambivalent children may both hit and embrace their mother on her return.</span>
I would say the last option students who bring weapons to school are acting on the rage they feel as victims of harassment.
Answer:
Physically active jobs can sometimes cause physical harm due to repetitiveness and bad working conditions. Putting a lot of stress on your body can have long term effects, like working for construction or doing anything heavy lifting damages your body over time.
Force & Leverage explain how the body works :)