The geologic time scale is an important tool used to portray the history of the Earth—a standard timeline used to describe the age of rocks and fossils, and the events that formed them. It spans Earth's entire history and is separated into four principle divisions.
<span>1. c) Exposure would weaken the body’s immune system and leave it unable to fight future infections. </span>2. <span>c) Excess amounts are removed by the kidneys and excreted along with urine.</span>
