The last answer the one about a small business
C, A diagram explaining how rain forests have a major effect on air quality
<span>A metaphor is a form of comparison without using the words such as "like" or "as," because that would be a simile. This means that C and D are incorrect, because those are examples of a simile, not a metaphor. In B, nothing is being compared, so that option is also incorrect. Thus, the correct answer is A, where "hooves of rain" is a metaphor - horses don't really have hooves made of rain, but somehow resembling rain. </span>
The serotonin is a chemical neurotransmitter in the brain responses to keep the "happy mood" in humans, so-called, the "the molecule of happiness". Low levels of serotonin may produce serious problems like depression, anxiety, memory low-self esteem, irritation and so on. When a lover has a low serotonin level in his brain, his mood and general behavior can be affected in great ways. Young people may not be aware of the great-negative consequences of the decreased levels of serotonin and a treatment should be carry out. Depression and anxiety can lead to terrible outcomes in someone's life.