Answer:
ocean productivity largely refers to the production of organic matter by "phytoplankton"plants suspended in the ocean most which are single - celled
 
        
             
        
        
        
It is the B the Arbor Vitae
        
             
        
        
        
Nutrient Leaching
Leaching is the process where dissolved nutrients in the
soil profile moves downward with percolating water. It is the loss of
water-soluble plant nutrients from the soil. The nutrients that seep through
the rooting zone may be recycled if roots grow deeper. 
 
        
        
        
Answer:
-There is a variation in traits.
-The environment cannot support unlimited populations of organisms.
there is heredity.
-The trait that allows the organism to have more offspring will become more common in the population of organisms.