Select the true statement in regards to healthy cardiac muscle. Neither summation nor tetany can occur. Neither summation nor tetany can occur. Both summation and tetany can occur. Both summation and tetany can occur. Summation, but not tetany, can occur. Summation, but not tetany, can occur. Tetany, but not summation, can occur. Tetany, but not summation, can occur. The refractory period of a normal cardiac muscle cell is relatively short. The refractory period of a normal cardiac muscle cell is relatively short.

surface mining destroys mountain tops, landscapes, forests and wildlife habitats. on top of that, it leads to soil erosion and destruction of agricultural land. the landscape changes can also disrupt river channels and streams, which leads to flooding. which, can destroy plant life and other animals as well.

explanation:

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.