Similar organisms that can reproduce by interbreeding belong to the same species.
This depends on the point of view, I believe. Chelicerate is not the direct ancestor of trilobites, but it is related but distantly.
The compound described above would be a sugar. Sugar contains carbon, hydrogen and oxygen atoms. In cells, it is used and produced in order to store and release energy. The most common sugar used in cells is glucose. It has a formula of C6H12O6.
Front, it is the boundary between two different air masses.
About 90% of our DNA is the same.
