How does the author support his argument that people depend on the continued existence of coral reefs?

By asserting that the reefs contain many plants and animals used in medicines, chemicals, or other products that humans need to lead healthy lives.

Explanation:

This is the main way in which the author in this text shows that people depend on the continued existence of coral reefs. Coral reefs are some of the richest and most diverse ecosystems in the planet. Moreover, this diversity has helped human beings, as we have been able to benefit from them enormously. Many of the plants and animals that we have discovered in these  areas have been used to develop medicines, chemicals or other products in order to make our lives happier and healthier.

"Her hair was whiter than snow, her smile was beautiful almost unreal.  

I couldn't bare to see her slip through my fingertips again.  

Lost in the darkness Afraid of the shadows.  " you finish the rest :D I started it for you.

or

" 'Whoosh!' went the wind. A girl with bright green eyes sighed so loudly that the ground shook. She was as annoyed as her parents were when she did something disobedient."

or

"I saw a girl . She was a glowing angel, a ray of sunshine.(metaphor) Her personality seemed childish and youthful. (connotion)Her lips were like pink petals on a rainy day.(simile) She seemed shy, but I was sure she would open up to me. (alliteration) "