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:
Some age-related development periods and examples of defined intervals are: newborn (ages 0â4 weeks); infant (ages 4 weeks â 1 year); toddler (ages 1â3 years); preschooler (ages 4â6 years); school-aged child (ages 6â13 years); adolescent (ages 13â19).