Answer: alternating dark and light bandsof protein filaments
Skeletal muscle fibers contain striations that can be described as alternating dark and light bands of protein filaments. Actin, tropomyosin, and troponin are among the protein filaments. The dark bands are the so-called A bands. Alternating light bands are referred to as I bands.    
        
             
        
        
        
There are no choices but the reason why we tend to value
friends as we grow older is because these are bonds that we create on our
own.  These are people who have been
there for us throughout our lives. They are our link with the outside world
since they are not our family members. 
The longer we are friends with others, the deeper that bond becomes.
 
        
             
        
        
        
I would say A. The enzyme is the wrong substrate
I hope this helped :3 
        
                    
             
        
        
        
Which Characteristic of life best describes the process of homostasis
        
             
        
        
        
Answer:
In the animals control and co-ordination is done by the  nervous system and endocrine system whereas in animals nervous system is adequately developed and consists of brain, spinal cord and nerves; in animals hormones are secreted by endocrine glands.
Explanation: