''Variations'' are seen in the organisms. State the two main causes of variation.

(N/A) Variations in organisms are primarily caused by the following factors:
$(1)$ Genetic changes: These occur due to inaccuracies or changes in the $DNA$ copying process during reproduction,leading to new combinations of genes.
$(2)$ Environmental factors: External influences such as light,temperature,nutrition,wind,and water supply can influence the phenotype of an organism.
$(3)$ Mutations: Sudden,permanent changes in the genetic sequence $(DNA)$ can also introduce new variations.