The human immunodeficiency virus (HIV) is a lentivirus (a subgroup of retrovirus) that causes HIV infection and acquired immunodeficiency syndrome (AIDS).AIDS is a condition in humans in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive.he human immunodeficiency virus (HIV) is a lentivirus (a subgroup of retrovirus) that causes HIV infection and acquired immunodeficiency syndrome (AIDS).
The definition of optimal is the most favorable. An example of optimal used as an adjective is in the phrase optimal score, which means the highest score someone can get on a game. most favorable or desirable; best; optimum. Origin of optimal.
On the other hand, when arousal level is too high, such as when we are too anxious or overstressed, we then resort to engaging in relaxation methods such as reading a book, getting a massage, or meditating. The maintenance of an optimal level of arousal provides the main motivation for the individual.What is defined as optimal, however, depends on the individual himself / herself and the varying contexts he / she experiences.he maintenance of an optimal level of arousal provides the main motivation for the individual. What is defined as optimal, however, depends on the individual himself / herself and the varying contexts he / she experiences.