The actual answer is, "A", an ocean trench.
You can find out more about them by researching them up on Google, it's only a few phrases and a hit on the enter key :P
Diagnostic Services.
Therapeutic Services.
Health Informatics.
Support Services.
Biotechnology Research & Development.
Adenine and guanine
Thymine and cytosine
Sorry the photo isn't clear
B. only 3% of water on earth is fresh