An investigation was conducted using three groups of laboratory X, Y, and Z, to determine the relative effects of glucose and adrenaline on the rate of heartbeat. The experimental conditions for each group of rats were kept the same excerpt for the type of solution injected, as shown in the data table below. According to the data table, which group of rats functioned as the control

the answer is "a.) well–developed vascular system."

explanation:

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.