Cardiac muscle fibers are electrically connected to neighboring fibers by

Gap Junctions.

Explanation:

Gap junctions are intercellular channels that allows the cell transfer of molecules, ions and electric impulses.

They are connected through the protein channel and are found in many parts of vertebrate and invertebrate nervous systems.

Its most important function is to control the activities of adjacent cells.

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amber has allowed scientists to study dna that has been preserved over millions of years.