Ībiogenesis, also known as the origin of life, is the natural process of life arising from non-living matter, such as simple organic compounds. Other definitions sometimes include non-cellular life forms such as viruses and viroids, but they are usually excluded because they do not function on their own rather, they exploit the biological processes of hosts. Organisms, or the individual entities of life, are generally thought to be open systems that maintain homeostasis, are composed of cells, have a life cycle, undergo metabolism, can grow, adapt to their environment, respond to stimuli, reproduce and evolve over multiple generations. Cells reproduce through a process of cell division, in which the parent cell divides into two or more daughter cells and passes its genes onto a new generation, sometimes producing genetic variation. There are two kinds of cells, prokaryotic and eukaryotic, both of which consist of cytoplasm enclosed within a membrane and contain many biomolecules such as proteins and nucleic acids. The gene is the unit of heredity, whereas the cell is the structural and functional unit of life. Biology is the science that studies life. Various forms of life exist, such as plants, animals, fungi, protists, archaea, and bacteria. Life is a quality that distinguishes matter that has biological processes, such as signaling and self-sustaining processes, from matter that does not, and is defined by the capacity for growth, reaction to stimuli, metabolism, energy transformation, and reproduction. Habitability of K-type main-sequence star systems.Planetary habitability in the Solar System

Archean – Present (possible Hadean origin)ĭiversity of Prokaryota which includes Archaea, Cyanobacteria, Bacillus, Campylobacteria, Enterobacteria, Diplococcus, and Spirocheteĭiversity of Eukaryota which includes Gray wolf, Giant sequoia, Entodinium, Amanita caesarea, Pterois antennata, Algae blooms, Chrysotoxum verralli, Xanthoparmelia lichen, Dictyostelium, and Pillar coral

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