Final answer:
The community with the highest biodiversity is C) Rainforest with abundant species, as tropical rainforests are ecosystems with a wide variety of niches that support diverse and often endemic life forms.
Step-by-step explanation:
The community with the highest biodiversity is C) Rainforest with abundant species. Biodiversity refers to the variety of life within an area and is determined by the number of different species present and their relative abundance. Tropical rainforests are known for their high biodiversity, as they provide diverse niches and habitats for an array of species, from flora to fauna. In contrast, grasslands, deserts, and the tundra have fewer species and often specialized organisms adapted for the specific challenges of their environments.
Furthermore, when comparing ecosystems like deserts and grasslands, which may have specialized or few species, with the lush and species-rich environment of a rainforest, the difference in biodiversity is stark. Not only does the rainforest have a multitude of species, but many of these species are also endemic, meaning they are found nowhere else on Earth.
In summary, a tropical rainforest clearly illustrates a community with the highest biodiversity due to its dense and varied population of organisms, making it a critical area for conservation efforts.