<span>Diet and exercise are the two important variables to increase life expectancy. Balanced diet helps to control many diseases such as diabetes, heart disease, high cholesterol, and hypertension. Adding exercise with proper diet can help control many health conditions and diseases by keeping the body at a healthy weight and balancing nutritional intake.</span>
Homologous structures compare the same anatomical features in different species. C is correct because it compares the same trait (wings) in different species (dragonfly vs. bat)
