During the period, the first vertebrates appeared on earth. a. cambrian b. ordovician c. silurian d. devonian

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

Which was most likely an effect on society that resulted from improvements in blood handling during world war i and world war ii?

Which label correctly identifies what x represents in the concept map?