The heritable characters are the traits that are determined by the heredity material (genetic material) of the organism.
The heritable trait ensures the reproductive success of the species but the trait is also influenced by the environment.
In the given question, the height of the oak trees is determined by the genetic material but the variation on height is the result of the environmental characteristics. The height of the tree could have varied due to the exposure to the sunlight (more sunlight more height) or the available nutrients.
Number of Squirrels Entering and Leaving a Population after 1 Year Cause of change Number of squirrels Died from predation 2 Born 4 Immigration 10 Left to find food 3 Died from disease 8 Left to find a mate 3 Population growth is decreasing.
