prokaryotic cells do not have a nucleus.
One simple difference is that stems bear leaves, and roots don't. ... Similarity: Both stems and roots contain vascular tissues (xylem and phloem), the circulatory system of the plant. Difference: In herbaceous stems, the vascular tissues are contained in bundles; these bundles sit relatively near the surface of the stem.
The variety of organisms that occupy a given region including microscopic protists to large mammals. The region can be a political unit such as a country a geographic feature such as a mountain range or the entire world. The first level of bio diversity is genetic diversity. Next is taxonomic diversity. Also ecological diversity.
Climate and weather, since the ocean currents circulate warm and cold water around the earth. Kind of like the butterfly affect, one thing happens over there another thing happens over here. I hope that you find this helpful!
