Which term describes the process that results in birds and bats having similar wings?

Which term refers to the total dollar value of the goods and services produced in a country in a year?

What causes darkening of the skin as melanin production increases

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