Mutations of TYR and MITF genes are associated with plumage colour ... by Wang, Ye; Li, Si-Ming; Huang, Jing; Chen, Shi-Yi; Liu, Yi-Ping / Asian-Australasian Journal of Animal Sciences.
Flexibility is not important when performing daily tasks. Please select the best answer from the choices provided.
Any activity that requires a large range of motion will increase your flexibility, assuming you do it consistently and strive for proper technique: gymnastics, olympic weightlifting, martial arts, break dancing, parkour, climbing. Of course, dedicated stretching is going to be most effective of all, but doing some of these is better than nothing.