<span>the answer to your question is definitely genes</span>
Answer:
Both are breathing muscles
Explanation:
When rib muscles and the diaphragm contract they increase the volume of the chest cavity, increasing the air pressure outside the body, causing air to rush into the lungs to fill the vacuum created by the increase in volume.
Smooth muscles depolarize as a result of a transmembrane current of Calcium ions. When an action potential depolarizes the muscle cell membrane, it also travels into the body of the cell via the t-tubules. Unlike skeletal muscle, smooth muscle is dependent in two sources of calcium in order to intiate contraction. These two sources are calcium sequestered in the S.R. of the smooth muscle cell.
Genetic variation is advantageous because it enables some individuals and, therefore, a population, to survive despite a changing environment.
This is the case since earthquakes form directly from tectonic plates. It happens when 2 tectonic plates pass by each other and causes fiction from the bumby sides of the plates
