False
<span>Marine ecosystems like lakes and oceans have aphotic zones. Aphotic zones refer to the zones in the water where there is little or no sunlight. It is found in bodies of water were depths only receive less than 1% of sunlight penetrations. Bioluminescence is essentially the only light found in this zone and most food comes from dead organisms that sink at the bottom of lakes or oceans. </span>
        
             
        
        
        
Answer:
A.OSHA
Explanation:
The complete question is as follows:
Who mandates that employers of emergency responders must take certain measures to protect employees who are likely to be exposed to blood and other body fluids?
A.OSHA
B.UNICEF
C.CDC
D.USMLE
- OSHA is the short form for the Occupational Safety and Health Administration  which is an agency of the  United States Department of Labor located in Washington D.C, USA. 
- The agency works to set and enforce standards for safe and healthy working environment for both men and women who work in private and public sectors. 
- The employers of OSHA have the responsibility to provide a safe workplace and ensure that no serious health hazards take place in the same. 
- Therefore the employers of emergency responders are mandated by OSHA to take measures to protect employees that are exposed to body fluids and blood. 
 
        
             
        
        
        
The answer is B. 
Im pretty sure water is important for some organisms.