Solution:
Nitrogen is important because, it helps us grow crops, and it produces grass for animal. It comes from lightning and is named nitrogen fixation
By which free nitrogen (N2) is extracted from the atmosphere and converted (fixed) into nitrogen compounds which are plant nutrients (fertilizer). In nature, this process is carried out by certain bacteria (present in the root nodules of legumes such as beans and peas), blue-green algae, and the lightning flash.
Thus the Nitrogen form the atmosphere the biotic part to the ecosystem converted into the biotic part.
 
        
             
        
        
        
Hello! I got the answer! So if you look at the word homo and hetero. Homo means the same and hetero means different. So homology is the study of to show the simliarity between organisms. And heterology is the study of to show difference between organisms. This is my first time answering! Anyways have a good day/night!! 
  
        
             
        
        
        
Answer: An object with twice the mass of another object will weigh twice as much is the statement accurately describes the relationship between mass and weight. 
Hope it helps you if not sorry 
Explanation: A.Mass is an objects weight multiplied by the amount of gravitational force acting upon the object
 
        
                    
             
        
        
        
Answer:
The example for population density is "two jaguars per thousand hectares"
Explanation:
To known the population size per unit area we use population density. Or sometimes use it for volume. It is expressed in quantity or in the type.  Mostly used for the living organisms, specifically humans. It's unit is expressed in square kilometers or may say in square mile. It is used for country, city, town and another territory. The negative relationship is found to affect the population density. It depends on the reproduction and survival.
 
        
             
        
        
        
Answer:
False
Explanation:
Gram stain technique is a method use to classify bacteria into large groups base on their different cell wall components. It differentiate gram positive and gram negative by coloring them with red or Violet colors.
Gram stain is use for identification and classification of bacteria.
Gram positive stain violet due to presence of thick layers of peptidoglylcan in their cell walls and gram negative stain red due to thin layers of peptidoglylcan in their cell walls.