25 points
which of the following represents one of the steps through which simple cells are h...
25 points
which of the following represents one of the steps through which simple cells are hypothesized to have been produced?
a abiotic synthesis of small organic molecules
b formation of nitrogenous bases from amino acids
c joining of self-replicating molecules into protocells
d packaging of inorganic macromolecules into vesicles
Answers: 3
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Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins
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Fill in the blank with the best word to complete the sentence. white blood cells protect against and aid in blood clotting when injuries are sustained.
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