The statement best supported by the theory of evolution is:
"Successive generations of fast individuals survive and reproduce more successfully than slow individuals of the same species."
This statement reflects the concept of natural selection, where individuals with advantageous traits (in this case, speed) are more likely to survive and reproduce, leading to those traits becoming more common in subsequent generations. The focus on a specific trait (speed) and its impact on survival and reproduction aligns with the principles of evolutionary biology.