The correct answer should be gymnastics. While the other mentioned sports could help him too, gymnastics is the most comprehensive one because it involves almost every muscle in the body to do various exercises, whereas biking would increase his leg muscle fitness most, but would not do much for the rest of his body.
They reproduce with different species to make different types of species.
I hope that this helps.
You most likely have something to do with dna and everyhting e;se
True...yes it is an example of Communication Roadblock
Answer - Blood Flow
Reasoning - Insulin is used through out and mainly in the blood stream which relies it to stabilize through out the flow of the body