Hydropower is practical used in business, home, and schools because its a back up power during electricity outages
Semipermeable means only certain substances can pass through. I imagine you are talking about cell membranes which are semipermeable. This means vital things like oxygen and nutrients are able to pass through the membrane, while not allowing everything to enter the cell
The condensation of water vapor formed the early oceans. It is an important part of the water cycle. It is easy to eliminate the other answers in this question. It can't be meteorites, living organisms, or nitrogen.
Answer:
Ponds:
Shallow & warm
A lot of plant and animal life
Many nutrients
Lakes:
Large, deep, cold
Little sunlight near bottom
Plants mainly along the shore
