Benzene is a colorless liquid with a sweet odor. It evaporates into the air very quickly and dissolves slightly in water.
In psychology the term, early childhood is usually defined as the time period from the age of two until the age of six or seven years. There are three simultaneous development stages:
Early childhood education at preschool, nursery school, or kindergarten (outside the U.S. and Canada) Primary education at primary school or elementary school, and sometimes in the early years of middle school. Secondary education at secondary school or high school, and sometimes in the latter years of middle school.