<span>Senescence is about growing old. When one is very old, the body naturally deteriorates, and this includes the cells of the body which make up tissues and then organs. The daughter cells not being sustainable is a vital factor in the body gradually being unsustainable.</span>
        
             
        
        
        
PHS defines an investigator as an individual, regardless of tittle or position, who is responsible for the design, conduct or reporting of research funded by the PHS or proposed for such funding. This includes key personnel identified in the grant application, progress report or other report submitted to the funding agency by the Institution. 
        
             
        
        
        
Answer:
 antibodies are produced in response to infection and that these antibodies are designed to specifically target particular antigens and bind tightly to them.
 
        
             
        
        
        
Answer:
Well I think your able to identify by looking at the Physical and Chemical Properties or by its Melting or boiling point. 
Hopefully this is correct 
 
        
             
        
        
        
C: primary Consumer
<em>primary consumers</em> are typically animals that eat plants aka herbivores. 
<em>producers </em>would be plants
<em>secondary consumers </em>are typically ones that eat meat or eat meat and plants aka omnivores.
 <em>decomposers, </em>I believe are like your fungus or anything that feeds off of dead organisms or eat the waste of that organism.
Hopefully this helped. I  remember learning about this in college.