Hey:)
Bottled water is definitely not a long-term plan.
Reducing the water consumption does not really solve the problem.
Store the rain water is a nice choice, but you cannot drink the rain water directly, it needs to be filtered.
Since the contamination is only caused by N and P, it should be easy to filter out, but still, it depends on the type of the compound of N and P.
I would choose the last option.
Answer: Keystone species
Explanation: A keystone species is a species which occupied a niche so central in the ecosystem that it has a disproportionately large effect on its environment and other species in it.
The coral's function in its ecosystem is so vital that if you were to remove it, the entire community would be drastically altered beyond recognition.
The coral serves as the base structure of its ecosystem.
That is to say that many corals are hermatypic(they form reefs). This reef serves as the environmental structure of the Coral's ecosystem. Built in and around it is a very biodiverse biotic environment. The coral not only serves as a hiding place and habitat for many marine organisms including fish, clams, lobsters, etc. It serves as resting place for larger animals like turtles and also serves as hunting sites for other animal species.
The most common way of determining a keystone species, is to see what happens when that species is removed from the ecosystem. Coral have shown to be so central to their ecosystem that the bleaching of coral reefs due to tourism and climate change causes a massive loss to biodiversity. And this is quite significant as reefs are the most biodiverse marine habitats.
Exactly what the person above said!
They will attract each other together
Digestion takes place inside Iysosomes containing digestive enzymes. Hope I helped!