They contain carbon, hydrogen, oxygen and nitrogen and usually sulfur, occasionally phosphorus. Proteins form a large and essential part of the body mass, comprising especially cell membranes, connective tissue, muscles, enzymes, hormones, blood proteins. To maintain this mass the diet must contain a high proportion of protein, especially in growing animals and those recovering from debilitating diseases.
Russian composer Sergei Prokofiev wrote Peter and the Wolf in 1936 after returning to Moscow following a 19-year, self-imposed exile. It is a children's musical story that teaches about the orchestra by introducing various characters portrayed by seven themes played on either solo instruments or groups of instruments.
The Tale of Peter Rabbit is a British children's book written and illustrated by Beatrix Potter that follows mischievous and disobedient young Peter Rabbit as he is chased about the garden of Mr. McGregor. He escapes and returns home to his mother, who puts him to bed after dosing him with camomile tea.