In the early 1930’s william rose fed laboratory rats a mixture of all 19 amino acids known to be present in proteins. he observed that his rats lost weight. this observation led to the discovery of as the 20th amino acid found in proteins.

2. how does the miller-urey experiment fall short of demonstrating that life can arise from inorganic molecules? explain. a. it doesn't show a leap between a collection of amino acids and a single-celled organism. b. it recreates the conditions that existed at the earth's beginning, but no molecules form as a result. c. it doesn't provide evidence of the formation of amino acids. d. it doesn't show how multicellular organisms developed from unicellular organisms