a)the number of species on Earth  or b)the number of individual organisms on Earth
 
        
             
        
        
        
C. Both types of reproduction enable genetic information to be passed from parent to offspring. 
It doesn't matter if the reproduction is sexual or asexual, because the offspring has the parent(s) dna and genetics either way.
 
        
                    
             
        
        
        
so, an example of something that might not be a substrate is the animal itself. 
explanation
substrate is the surface of where living animals, live. 
sorry if this doesnt help. 
HAPPY ALMOST HALLOWEEN
 
        
             
        
        
        
Answer:
The bones are homologous structures 
Explanation:
Homologous structures are the structure which are found similar in appearance in different organisms. 
The homologous structures in different organism shows that they shared a common ancestor or they diverged from a common ancestor during course of evolution that is these homologous structures are the result of the divergent evolution.
In the given question, the bat, dolphin and the cat shows the same structure of bone which indicates that they have evolved from a common ancestor and is true as they all belong to mammals.
Thus, the bones are homologous structures is correct.
 
        
             
        
        
        
Needed:
Co2
Water
Solar Energy(Sunlight)
Produced:
02
Glucose for the plant to use for survival