One thing scientists in the late 1700s could determine about the fossils they were finding were fossils in the upper layers were younger than fossils in lower layers. The correct answer is A.
South Africa is the most stable country south of the Sahara
Similarities:
- Marine and freshwater ecosystems are water, covering almost 75 percent of the earth's surface.
-The most pervasive problem affecting both freshwater and marine ecosystems is pollution.
-The process of regulating the osmotic pressure on fluids inside an organism is essential to all freshwater and marine species.
Differences:
- Marine ecosystems are more diverse than freshwater ones.
- In marine or seawater, the salinity level, or the concentration of salt is greater, but freshwater is not totally void of it.
- Only 1% of the whole water body on the earth is freshwater, the other 99% is marine water.
Note- I couldn't come up with ones for estuaries, sorry.
