Answer:
The lateral ventricle is connected with the third ventricle via the foramen of monro. The third ventricle is connected to the fourth ventricle via the cerebral aqueduct (also called the aqueduct of Sylvius).
Explanation:
An organism has syncytial nuclei, which leads to parasynchronous or synchronous mitosis and therefore, multiple nuclei undergo the process of mitosis at the same time. This happens to the nuceli present in one cytoplasm, i.e., one cell.
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The answer is: a barrier prevents gene flow between two populations of the same species.