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The atria and ventricles work together, contracting and relaxing to pump blood out of the heart in a coordinated and rhythmic fashion. As blood leaves each chamber of the heart, it passes through a valve.
Answer:
Unicellular organisms
Explanation:
Because they only have one cell, they are called unicellular
Answer:
The nucleobase of a nucleotide involved in base pairing, as of a DNA or RNA polymer.
Explanation: