B). A population changes in response to a change in the environment.
        
             
        
        
        
The abiotic factors that could cause the sea cucumbers to
differ their distance from one another are temperature, time of the day, and
humidity. The biotic factors that could influence are the organisms around
these creatures. Furthermore, the independent variable in this study is the
time of the day where observed are the average distance between these sea
creatures and their output, the distribution of sea cucumbers as the dependent
variable.
Hypothesis: There is a link between the time of the day and the distance of sea cucumbers amongst each other.  
 
        
             
        
        
        
The correct answer is:
fixation
Explanation:
Nitrogen fixation is a method by which nitrogen in the Earth's atmosphere is converted into ammonia or other molecules prepared to living organisms. Nitrogen fixation is carried by a diversity of bacteria, both as free-living organisms and in symbiotic association with plants. Because it is the primary source of the nitrogen in the soil, nitrogen that plants need to grow, nitrogen fixation is one of the most critical biochemical processes on Earth
 
        
                    
             
        
        
        
Average mass of the atoms of an element measured in atomic mass unit
        
                    
             
        
        
        
Answer: aragonite oyster shell crab meal 
Explanation: aragonite is for calcium and oyster shell also has calcium. Crab meal provides small amounts of protein and minerals