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.
Answer: The first one, to keep the blood flowing in only one direction
Answer: When turned on, genes provide the code for creating protein molecules, the building blocks of physical development.
Explanation:
<span>A. Arthritis only affects old people.
Arthritis can affect many people, even children
hope this helps
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