This overwhelming majority of plant life is primarily due to the abundance of microscopic organisms such as bacteria, fungi, and algae. These organisms play critical roles in the planet's ecosystems by producing oxygen, participating in nutrient cycling, and providing food and habitat for countless species.
Animal life, while comparatively smaller in biomass, exhibits much greater diversity in terms of species count and ecological roles. From the smallest insects to the largest whales, animals occupy various niches and contribute to ecosystem functioning through processes like pollination, predation, and seed dispersal.
While both plants and animals are vital components of Earth's biodiversity, the sheer dominance of plant biomass highlights their central role in sustaining life on our planet.