Answer: Red blood cells, also referred to as red cells, red blood corpuscles, haematids, erythroid cells or erythrocytes, are the most common type of blood cell and the vertebrate's principal means of delivering oxygen to the body tissues—via blood flow through the circulatory system.
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Answer by JKismyhusbandbae: practice abstinence
Why: Only abstinence is 100% effective in preventing unplanned pregnancy and STD’s.