Final answer:
Adolescence and adulthood are growth stages unique to humans, involving significant developmental changes during these periods of life.
Step-by-step explanation:
The growth stages of adolescence and adulthood are unique to humans. These stages are characterized by significant psychological, physical, and social changes. During adolescence, individuals undergo puberty, developing secondary sex characteristics and achieving reproductive maturity. Adulthood is marked by full physical maturity, and individuals continue to develop emotionally and intellectually throughout this stage.