well rainforests do tend to have alot
Its probably krill, or algae.
Just switch population with ecosystem to get them most to least complex.
ecosystem
The part of an ecosystem where an organism lives and feeds is called its habitat.
Organism, Population, Community, Ecosystem.
habitat, ecosystem, biome, biosphere.
Every organism plays a vital role in the ecosystem, but some key roles include producers (like plants that make food), decomposers (like fungi that break down organic matter), and apex predators (like top predators that help regulate populations). Each of these roles contributes to the balance and functioning of the ecosystem as a whole.
Organisms survive in an ecosystem by being in a food chain or adapting to the resident food web. For an organism to survive in an ecosystem in needs to find a way to belong. Sometimes when an new organism is introduced to an ecosystem they adapt too well and they are classified as an invasive species. The organism will either have to adapt to the ecosystem or die out.
oak trees
universe, galaxy, planet, cell, organism, tissue, organ, ecosystem
An ecosystem.
An organism's particular role in an ecosystem is known as its ecological niche. This niche includes its interactions with other organisms and its unique way of obtaining resources and contributing to ecosystem function. Each organism plays a specific role in maintaining the balance and health of the ecosystem.