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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.
The ozone layer
Mycobacterium tuberculosis
There is variation among humans because of sexual reproduction, crossing over, assortment, and mutations.
Variation within species can be caused by genetic mutations, environmental factors, and interactions between genes and the environment. Genetic mutations are changes in the DNA sequence that can create new traits. Environmental factors, such as diet and climate, can also influence variation by selecting for certain traits over others.
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.
It has adaptations