Answer: because oil is less dense than water and therefore it floats to the surface.
Explanation:
 
        
             
        
        
        
An endangered species is a type of species in which this type of organism has decreasing numbers and are dangerously close to going extinct. Invasive species are species in which an organism invades an environment where it is not native to, and take over the ecosystem. Local species are species in which the organism is native to that environment and plays a key role in that ecosystem. A keystone species is a species in which the organism is a key part of that ecosystem to thrive; without it, the ecosystem would collapse
        
             
        
        
        
Answer:
B.) Anaphase II
Explanation:
In metaphase II, the chromosomes line up individually along the metaphase plate. <u>In anaphase II, the sister chromatids separate and are pulled towards opposite poles of the cell.</u> In telophase II, nuclear membranes form around each set of chromosomes, and the chromosomes decondense.
 
        
             
        
        
        
Answer: d. assimilating the nitrogen into their own biomolecules.
Explanation: I just had this question for an assignment. 
Hope this helps!  :)
 
        
             
        
        
        
Answer:
Sorry, I'm confused there has to be more to it if there is not then there is no true way for anyone to fill in the blanks. <3