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:
D is preferable.
Explanation:
The behavior response requires communication between cells and an organ system.
<span>The answer is letter C.<span>
<span>The
operative word for the sentence is exercise. The effect of developing good endurance
is caused by exercise. Exercises that are performed on a regular basis give
individuals many beneficial effects to health and overall development.
Individuals should at least exercise 30 minutes a day, 3-5 times a week in able
to reap the benefits that it could bring to the body internally and externally.
But before any training regimen, individuals should consult a physician to
ensure that the activities to be performed will be safe. </span></span></span>
I think that B. is the answer, because when stressed people often become hostile and negative so it could benefit them to have someone to brighten up their days. : )
