It's a system of chronological dating and geologists use it to describe the timing and relationships of events in Earth's history
<span>The two identical chromosomes that result from DNA replication are referred to assister chromatids. Sister chromatids are held together by proteins at a region of the chromosome called the centromere.</span>
The Sun is the energy source for almost all life on earth.
A. The connective tissues that protect the inside of the arteries and veins.
