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it has a diverse variety of plants and animals that live together
In the rainforest regions.
a greater mass of animals than plants
Tropical rainforests support the widest variety of plants and animals due to their high levels of biodiversity. These ecosystems provide a range of habitats and niches for a diverse array of species to thrive.
Actually, the rainforest supports the greatest number of species of plants and animals. The grasslands support a greater variety of species than the desert.
Succession
An ecosystem is a place where plants and animals ( maybe humans ) live and animals and plants live in the desert so … 
These factors includes the availability of rain. The type of animal in the ecosystem also affects the ecosystem. Finally the activities of both humans and animals affects the ecosystem.
Show a ecosystem diagrams about animals rain forest rivers plants?
Forest ecosystem animals eat a variety of things depending on their species and diet. Herbivores consume plants and fruits, carnivores eat other animals, and omnivores have a diet that includes both plants and animals. Some animals in the forest may also feed on insects or fungi.
The rich variety of animals and plants is biodiversity.