Rosenberg MJ, Meyers A, Roy V. Efficacy, cycle control, and side effects of low- and lower-dose oral contraceptives: a randomized trial of 20 micrograms and 35 micrograms estrogen preparations. Contraception 1999; 60:321. Gallo MF, Nanda K, Grimes DA, Schulz KF. 20 mcg versus >20 mcg estrogen combined oral contraceptives for contraception. Cochrane Database Syst Rev 2005; :CD003989. Bachmann G, Korner P. Bleeding patterns associated with oral contraceptive use: a review of the literature.
A molecule is formed from two or more atoms of a single element. An example is h2o. two hydrogen atoms and one oxygen atom forming a molecule of water! This question is archived.
A chemical compound is a chemical formed from atoms of different chemical elements.The different atoms are joined by chemical bonds. The elements stick together so strongly that the compound behaves like one substance. The chemical that is made depends upon what atoms it is made of and how they are joined together. chemical compound is a chemical formed from atoms of different chemical elements.