The genes.
revolution of earth around the sun causes the variation in the temperature..
A schedule variation is the difference between the time an activity is scheduled to be completed and the actual time it is completed. Any deviation in the scheduled time causes a variation.
it is caused when the variation is hit on the guitar
variation in the distance between earth and the sun
the enviroment.
Mycobacterium tuberculosis
Distemper in cattle is caused by a virus. The virus is usually spread from animal to animal, the virus can originate in other animals and spread to cattle.
There is variation among humans because of sexual reproduction, crossing over, assortment, and mutations.
Ranchers or those crazy folks who buy a piece of land and use it only for grazing cattle.
It has adaptations
genetic variation