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:
Children with autism do not follow the typical patterns of child development. In some, signs of future problems may be apparent from birth. Other children develop typically at first, but between the ages of 18 and 36 months, their development stagnates.n other cases, there is a plateau or leveling of progress, and the difference between the child with autism and other children the same age becomes more noticeable. A recent study of a U.S. metropolitan area estimated that 3.4 of every 1,000 children ages 3 to 10 had autism.