To reference a VHDL library or package file in your VHDL file, do the following: 1  To reference a package file, include a use statement. 2  To reference a library file, include a use and a library statement.
Animal and plant adaptations and behaviours. Adaptations help organisms survive in their ecological niche or habitat; adaptations can be anatomical, behavioural or physiological. Anatomical adaptations are physical features such as an animals shape. Behavioural adaptations can be inherited or learnt and include tool use, language and swarming behaviour. Physiological adaptations include the ability to make venom; but also more general functions such as temperature regulation.
The functional definition allows us to identify adaptive traits, while the historical definition allows us to identify adaptations. Adaptive traits are those that increase the fitness of an organism [in a given environment]. Adaptations are adaptive traits that got selected for and remained. To understand the difference: vestigial organs are adaptations, but they are no longer adaptive. In other words, they were adaptive at one point and got selected for, therefore they are adaptations.