International Operations works with the Department of Homeland Security and other U.S. agencies to vet participants in International Visitors Program events nationwide.
Life cycle. Life cycle means the stages a living thing goes through during its life. In some cases the process is slow, and the changes are gradual. Humans have various steps during their lives, such as zygote, embryo, child and adult. The change from child to adult is slow and continuous.
Medical Definition of life span. 1  1: the duration of existence of an individual. 2  2: the average length of life of a kind of organism or of a material object especially in a particular environment or under specified circumstances.