sources of variation

The ultimate source of variations is

Ultimate source of variation is

Ultimate source of variation is

What is the source of variation in monoparental (asexual) reproduction ?

Which source of variation is denied to the asexually reproducting organisms and self-fertilising hermaphrodites ? Which phenomenon needs to occur to bring about variation in such forms ?

Spherical sound waves are emitted uniformly in all direction from a point source. The variation in sound level SL. As a function of distance r from the source can be written as where a and b are positive constants.