What part of the body did you exercise or overload when performing cardiovascular fitness exercises such as the one-mile run?

The legs are the parts of the body that are exercised or overloaded when performing cardiovascular fitness exercises such as the one-mile run. Cardio exercises affect many parts and systems of the body, such as the muscles and bones (especially in the legs), the circulatory system (makes the heart stronger) and the respiratory system (makes the lungs healthier).

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.