The plasma membrane completely covers the surface of the protoplasm.
Answer: Number 2, aka Solid wastes on land.
Explanation: Bacteria in soil is a natural thing, so it's not polluting the earth. Oxygen in the atmosphere is letting us live, meaning it's not polluting the earth. Fish in rivers is also another natural thing, leaving us with solid wastes on land.
<span>Processes that increase the density of seawater include evaporation and sea ice formation. The density of seawater primarily depends on two factors, temperature and its salinity. When temperature is decreased and salinity is increased, the density increases. Sea ice formation lowers the seawater's temperature, while evaporation increases the salinity.</span>
Photosynthesis is the process.
