Identify the body cavity in which each of the described activities takes place.
Blood within veins gives up carbon dioxide and picks up oxygen:

Food is digested and its nutrients are absorbed:

A human baby develops before it is born:

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The main role of dna in the  cell is the long-term storage of information. it is often compared to a blueprint, since it contains the instructions to construct other components of the  cell, such as  proteins  and rna molecules.the main function of rna is to carry information of amino acid sequence from the genes to where  proteins  are assembled on  ribosomes  in the  cytoplasm. mark brainliest, my work is good.