A phenotype is a trait we can observe. Genes carry instructions, and the result of our body following those instructions (for example, making a pigment in our eyes), is a phenotypic trait, like eye color.
The medical term for expanding or opening wider is. apnea. the medical term for lack of or absence of breathing is. tissue. the medical term for groups of cells with the same function is. cell. the medical term for the basic unit of body structure is. menarche.
In contrast, anaerobic (without oxygen) exercise is activity that causes you to be quickly out of breath, like sprinting or lifting a heavy weight. Examples of aerobic exercises include cardio machines, spinning, running, swimming, walking, hiking, aerobics classes, dancing, cross country skiing, and kickboxing.