Answer: #4
Explanation: if they are different shapes and preform the same rate and job that wouldn't make sense and they cant work at different rates because they need to work together, therefor by process of elimination #4 is the answer
The insertion mutation affect the DNA by changing certain cells
Three types of muscles is skeletal muscle, cardiac muscle and smooth muscle .
I would select B or C as the answer because i have no idea what the other ones are :)