How is population growth measured ?

Growth rate can be calculated either from census data or from civil registration data (births and deaths) together with information on migration. Usually done every 10 years.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation:

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.