Eukariontisista

Eukariontisista, also known as Eukaryotes, are a domain of organisms whose cells contain a membrane-bound nucleus and other membrane-bound organelles. This domain includes all animals, plants, fungi, and protists. Eukaryotic cells are generally larger than prokaryotic cells, with a more complex internal structure. The nucleus, which houses the genetic material, is a defining feature of eukaryotic cells. Other organelles found in eukaryotic cells include mitochondria, endoplasmic reticulum, Golgi apparatus, and chloroplasts in plant cells. Eukaryotic cells also have a cytoskeleton, which provides structural support and aids in cell movement.

Eukaryotes are believed to have evolved from prokaryotic ancestors through a process called endosymbiosis, where a prokaryotic cell was engulfed by another, leading to the formation of organelles like mitochondria and chloroplasts. This process is thought to have occurred around 1.5 to 2 billion years ago. Eukaryotes exhibit a wide range of biological characteristics, from single-celled organisms like amoebas to complex multicellular organisms like humans. They play crucial roles in various ecosystems, contributing to processes such as photosynthesis, decomposition, and nutrient cycling. The study of eukaryotes is a vast and diverse field, encompassing disciplines like cell biology, genetics, and ecology.