The rectus abdominics covers the anterior abdominal wall. its superior attachment includes the xiphoid process and cosatl cartillages of 5 ribs through 7; its inferior attachment includes the pubic symphysis and pubic crest. the muscle depresses the ribs and flexes the vertevral column. which attachment ( superior or inferior) is the origin, and which is the insertion? explain.

Astudent drew the following flowchart to show the movement of nutrients. soil → roots → plants →? where does nitrogen go next? a. directly into nearby animals as nutrition b. directly into aquifers through condensation c. directly into the air through evaporation d. directly into nearby plants during fixation

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

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.