Cytoplasm maintains the internal pressure in the cell.
A cell with a nucleus. The opposite is a prokaryote; a cell without a nucleus.
Answer should be A if multiple choice
Answer:
Groundwater
Explanation:
Groundwater, which is in aquifers below the surface of the Earth, is one of the Nation's most important natural resources. Groundwater is the source of about 33% of the water that county and city water departments supply to households and businesses (public supply).
Most things can't be explained or it hasn't been discovered yet. Science is all about asking questions and figuring out how things are the way they are.