What is a kingdom in biology?

There are 5 kingdoms (kingdoms is the way of classifing organisms)

1. kingdom Monera (bateria and other single prokaryotic cells)

2. kingdom Protista (microscopic organisms made of 1 or more eukaryotic cells)

3.kingdom Fungi (fungi (of course) made of eukaryotic cells and eats deadorganisms)

4. Kingdom Plantae (all plants which are made of many eukaryotic cells)

5. kingdom Animalia (all animals and people many many eukaryotic cells we humans are made of about 100 trillion!) Being in Kingdom Animalia does NOT mean we are animals though we are just made of the same cells!

Hope this helps!