Answer: The right answer is Cave-ins.
Explanation: Excavations and trenches are basically the man-made cuts inside the Earth's surface. These are made for multiple purposes such as mining or tunneling. One of the obvious risk while working in such excavations and trenches is cave-ins. It is basically collapse of that excavation or Trench. The roof of the mine collapses and people working under it get buried inside those excavations in trenches.
The uncontrollable muscle spasms
The liver makes sure that blood glucose levels remain steady. But when blood glucose levels fall, the pancreas secretes glucagon. Therefore the answer to your question in the pancreas.
My hypothesis is that the female shark reproduced asexually since she was left alone in her own tank with no male sharks around.
