Hallucinogens are a diverse group of drugs that cause an alteration in perception, thought, or mood. A rather heterogeneous group, these compounds have different chemical structures, different mechanisms of action, and different adverse effects.allucinogens are a diverse group of drugs that cause an alteration in perception, thought, or mood. A rather heterogeneous group, these compounds have different chemical structures, different mechanisms of action, and different adverse effects.
Which US President served the shortest term in office? William Henry Harrison, 9th President ,who died in office on April 4, 1841.served the shortest term of any president: March 4 - April 4, 1841. He served 30 days, 12 hours, andâ¦ 30 minutes. He died of pneumonia. William Henry Harrison only held office for 32 days.
The longest serving president was Franklin Delano Roosevelt who served 4 terms and a total of 12 years 1 month and 8 days as the president of the United States.n March 21, 1947 America passed the twenty-second amendment (Amendment XXII) to the United States Constitution and it was ratified by the requisite number of states on February 26, 1951 which limited the term any one person can serve as President.