Verbal: communication with words, which may be done orally through speech or physically through sign language
Nonverbal: communication that does not involve words
Interpersonal: any type of communication, verbal or nonverbal, between two or more people
Group: communication between groups of people or within a group of people
The last one is not true. Only the second statement mentions how fragile the environment is that coral reefs exist in.The first statement focuses on erosion and pollution as causing the reefs to die.
Just think of two things that could be compared in an unusual way! A metaphor is just a comparison that doesn't use "like" or "as". For example, a simile would be "My love is like a rose" but a metaphor would be "My love is a rose" If you think of it this way, it might be easiest to think of a simile then take away "like" or "as". Be creative with it and have fun