They’ve helped end/calm down pandemics and epidemics and allowed us to go out and start living our life again.
You don’t have to use this word for word just an idea
Answer:
Substrate. The substrate is the surface on which the river organisms live. It may be inorganic, consisting of geological material from the catchment area such as boulders, pebbles, gravel, sand or silt, or it may be organic, including fine particles, leaves, wood, moss and plants.
Foxes consume on rabbits, so the more foxes, the more rabbits consumed hence less rabbits. But as a long term effect, if the rabbit population keeps decreasing, then the fox population will eventually start decreasing also as they'd have less food available.
foxes increase --> rabbits decrease
(long term) rabbits decrease --> foxes decrease
