Games are played with rally serving. Questions to choose from:

12
15
25
All of the above

HURRY HELP ME!!
(VOLLEYBALL)

wavelength variability is the right one

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.