Hundreds of animals, from tiny ants to mighty hippos, are shaping the Earth's surface as powerfully as floods and storms.

The environment around us is full of dead, living and non-living things. Trees and animals are living things. Dry leaves on the ground are dead, but they were once part of a living tree.

Explore the streets and urban habitats where we live and the different animals that can be found there. What is dead, living and non-living? Learn about dead, living and non-living things.

How do scientists figure out relationships between living things? Some scientists compare ... Two fishy-looking animals and a four-legged, furry one. First we need to find the ancestral line ...