If I had to guess it would be C metabolism
If the prey population is thriving, then the predator population will as well- or at least, until they eat out that population, then the prey and the predators will be at a decline. It's a balance.
Answer: Here are some ecosystems i've heard of: are forests, grasslands, deserts, tundra, freshwater and marine. The word “biome” may also be used to describe terrestrial ecosystems which extend across a large geographic area, such as tundra.
The four ecosystem types are classifications known as artificial, terrestrial, lentic and lotic. Ecosystems are parts of biomes, which are climatic systems of life and organisms. In the biome's ecosystems, there are living and nonliving environmental factors known as biotic and abiotic.
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It is a 25% chance of both of them being heads.