Are insects the most abundant creatures on Earth?

Insects are indeed the most abundant creatures on Earth, both in terms of species diversity and individual numbers. They play essential roles in various ecosystems, including pollination, decomposition, and serving as a food source for many other animals. Estimates suggest that there are millions of insect species, with some estimates indicating that insects may make up over half of all known living organisms.

Their vast numbers can be attributed to their adaptability, varied habitats, and efficient reproductive strategies. Insects can thrive in nearly every environment on the planet, from the deep sea to the highest mountains, which contributes to their status as the most abundant group of animals.

The other options are less accurate because they imply limitations or conditions under which insects would not be considered the most abundant. The existence of insects is not confined to particular regions, nor does it depend on regional variability; they are pervasive throughout all ecosystems, demonstrating their universal abundance across different environmental contexts.