Archaeobiology is like when an adult plays detective and tries to find out what happened a long time ago by looking at really old stuff like bones and plants. You know when we learn about dinosaurs in school? Archaeobiologists study even older things from a time long long ago when people didn't even have cars or phones.
They start by digging in the ground and finding old things buried there. Sometimes they find bones of animals that lived a long time ago and sometimes they find plant remains like seeds or pollen. These old things are like puzzle pieces that can help archaeobiologists figure out what life was like a long time ago.
For example, if an archaeobiologist finds a bone of an animal that used to be really big, they might think that people back then hunted that animal. Or if they find a lot of seeds from one kind of plant, they might think that people back then liked to eat that plant.
Archaeobiology is important because it helps us understand how people and animals used to live a long time ago, and how they adapted to changes in their environment. It's like being a time traveler, looking at the past so we can learn from it and understand our world today.