The structure of the spinal cord can be described as(1) composed of thirty-one segments(2) having a cervical enlargement, lumbar enlargement, and two deep longitudinal grooves(3) a central core of gray matter that is surrounded by white matter(4) having gray matter that is composed of myelinated nerve fibers

What is thought to have caused the mass extinction at the end of the cretaceous period?

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 process of living things produces water that enters the water cycle