Answer:d.Paleozoic Era
Explanation:
Paleozoic Era is hallmarked by climate, animals & plants.
This Era includes the Ordovician Period, Silurian Period and the Devonian Period.
The Silurian Period is one during this era where aquatic plants and animals evolved.
by WASHING THEIR HANDS EVERY TIME THEY HANDLE FOOD OR USE THE LOUI!!!!!
There are two oxygen atoms. The OH is in parentheses with the 2 after it to indicate that there are two OH molecules, each containing on atom of oxygen.
Eukaryotic cells<span> contain membrane-bound organelles, including a nucleus</span>.Prokaryotic cells<span> do not contain a nucleus or any other membrane-bound organelle.</span>
