3. The right sided of the heart is completely separated from the left side by a wall of tissue called the .

Septum

Explanation:

In the normal heart, the right and left chambers are completely separated from each other by a wall of muscle called a septum. The right atrium is separated from the left atrium by the atrial septum and the right ventricle is separated from the left ventricle by the ventricular septum.

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the oceanic zone is typically defined as the area of the ocean lying beyond the continental shelf, but operationally is often referred to as beginning where the water depths drop to below 100 meters (328 feet), seaward from the coast to the open ocean.

explanation:

meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse