Answer:
B. Shortens
Explanation:
Myofibrils are components of the animal skeletal muscles that are made up of sacromeres. They perform the muscular contraction and relaxation via the sliding filament model.
To produce motion, A cross-bridge forms between actin and the myosin heads triggering shortening of the sacromere. This shortening of the sacromere results in the contraction of the muscle fibers, which the net effect can be seen to be a shortening of the fibers
 
        
                    
             
        
        
        
Answer:
evaporation:the process of a substance in a liquid state changing to a gaseous state due to an increase in temperature and/or pressure.
condensation: his is when water vapour in the air cools down and turns back into liquid water.
precipitation: released from clouds, water falls as snow or rain
Explanation:
 
        
             
        
        
        
TT and Tt genotypes both expressed the tall phenotype because the T is dominant to t.
        
             
        
        
        
Answer: B!
Explanation: This simply makes the most sense, as the population will go down when individuals die, and grow when more are born
A simple question, but I hope this helps you :)
 
        
             
        
        
        
I’d go with c) 
This is kind of controversial currently because there are different defintations of language but poplular opinion is tools first. Think apes are using rocks to open shells or something before they really communicate. 
Size of brain definitely increased tho