Place the following events in sequence: A) The atria fill with
blood; B) The valve between the ventricles and atria close;
C) Blood Is pushed out of the heart
А
А, С, в
BB, C, А
СА, В, с
D
В, А, С

Mario was conducting research regarding the treatment of aids victims using stem cells. he found a source that was written recently and the author was known. unfortunately, he could not determine if it had been peer reviewed.