A) A flap in the heart located between each atrium and ventricle.
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Answer:
The acid bath guy? He's Caucasian and born in England. Is this what you were asking or...?
Explanation:
A membrane that allows only some materials to move in and out of the cell is B. Semipermeable.
When h forms a bond with h2o to form hydronium ion, h3o , this bond is called a coordinate covalent bond.
