<span>Sense organs, such as the ear, and sensory receptors, such as those in the skin, are sensitive to external stimuli such as sound and touch.</span>
Sorry there are no answer choices
Some mutations don't have any noticeable effect on the phenotype of an organism. This can happen in many situations: perhaps the mutation occurs in a stretch of DNA with no function, or perhaps the mutation occurs in a protein-coding region, but ends up not affecting the amino acid sequence of the protein.
Physics, there are three types of main muscles, skeletal muscle, cardiac muscle, and smooth muscle, but it's physics that makes all these muscles contract, thus movement. So it's Physics that plays a big role in muscle movements.
A big change of some sort
Ex: She started a revolution and now everyone was donating to the needy