The first life forms to appear on Earth were unicellular, i.e., composed of a single cell, such as yeast or bacteria. Later, animals—multicellular organisms—evolved, developing from a single ...

Modern single-celled holozoa include the most basal living animals and the fossil discovered shows an ... into separate regions within a multicellular mass—existed in unicellular organisms a billion ...

but because plants and animals very likely evolved from unicellular to multicellular organisms separately (Meyerowitz 2002). Therefore, stem cells probably evolved independently in both kingdoms ...

We call them unicellular – like a unicycle but with ... multicellularMade from more than one cell. Can refer to an organism. animals and plants consist of different types of cells organised ...

Many species of multicellular organisms differ greatly from ... Evolution 62, 436–451 (2008). King, N. The unicellular ancestry of animal development. Developmental Cell 7, 313–325 (2004).

When subjected to physical pressure, archaea - ancient single-celled organisms - form multicellular structures.

New species of microscopic unicellular organisms (Papus ankaliazontas ... Chagas disease) and in animals (Trypanosoma equiperdum).