õõnselised

The term õõnselised refers to a group of eukaryotic organisms characterized by the presence of a membrane-bound nucleus containing their genetic material. This fundamental feature distinguishes them from prokaryotes, such as bacteria and archaea, which lack a nucleus and other membrane-bound organelles. Eukaryotes encompass a vast diversity of life, including plants, animals, fungi, and protists. Their cells are generally larger and more complex than prokaryotic cells, featuring various specialized organelles like mitochondria, endoplasmic reticulum, and Golgi apparatus, each performing specific functions essential for cellular life. The evolutionary emergence of the eukaryotic cell, known as endosymbiosis, is a significant event in the history of life, leading to the development of multicellular organisms and the complex ecosystems observed today.