B) Lysosome.
hope this helped!
        
                    
             
        
        
        
Answer:
The presence of predators of deer which does not allow increase in the population of deer year after year. 
Explanation:
In an forest ecosystem, one animal controls the population of another organisms and thus there is no increase in the population of that organism and the ecosystem is in equilibrium state. The population of deer did not increase due to the presence of predators such as lion, cheetah etc and the net population is 0.
 
        
             
        
        
        
Answer:
nucleotides
The DNA molecule is a polymer of nucleotides. Each nucleotide is composed of a nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group.
Explanation:
 
        
             
        
        
        
The three different material that can erupt from a volcano is 
1. Magma/lava (called Basaltic Lava)
2. Ash/ tephra
3. Igneous rock
        
             
        
        
        
1. SI, 
2. Number 10.
I'm pretty sure it's that, I just did something related to that.