Living things refer to living things, and usually refer to beings such as animals, plants, or humans. All living things on Earth have a common ancestor, and it is believed that evolution occurred due to various mutations in genes through reproduction of their descendants. Various living things, from bacteria to humans, exist and form a complex relationship of life sphere. It is also called an organism, an organism, or an organism.
Characteristics of Creatures
As a general characteristic that distinguishes living things from non-living things, living things have three abilities: self-renewal ability, energy conversion ability, and homeostasis maintenance ability.
A chemical reaction that synthesizes and decomposes substances necessary for the body
Energy must come in and out
Enzymes mediate the reaction.2. stimulus and response
Sensing and responding to changes (stimuli) in the environment as essential for survival3. maintain homeostasis
It has the property to keep the internal environment constant even if the external environment changes. Maintain body temperature, blood sugar level, and body fluid concentration4. reproduction and heredity
Leaving descendants similar to oneself in order to maintain the race.5. development and growth
Cells grow larger or increase in number by cell division.6. adaptation and evolution
Adapts to the current environment and can change as the environment changes. According to the theory of evolution, if the changed trait survives in favor of the environment, it becomes a new species.
7. Sophisticated and complex system
All living things are made up of cells.
Below are the classifications that belong to the organism.
Water, protein, fat, carbohydrate, and nucleic acid are the main components of living things. Among them, it is water that provides a place for chemical reactions to occur, and is an extremely important component.
One of the substances that complicates living things is protein. Proteins are composed of several dozen to hundreds of 20 amino acids, but depending on these permutations, the types range up to tens of millions. A protein is an enzyme that catalyzes a chemical reaction, acts as a backbone that supports the structure of a certain organism, and has multiple functions.
Just as Robert Hooke gave the name a small room (cell) when he first discovered the cell, a cell is a space with boundaries, and living things are established by isolating them from the outside world. This division is called a cell membrane, and lipids are its main component. Fats are good substances for storing energy.
Creatures are isolated spaces with boundaries, but are not completely cut off from the outside world. It draws energy from the outside and consumes it inside. Carbohydrates are important for energy distribution between living things, and plants mainly produce them through photosynthesis.
On December 2, 2010, NASA officially announced the existence of GFAJ-1, a creature that uses arsenic instead of phosphorus.
History of Creatures
4.6 billion years ago - Earth was born.
4 billion years ago - Life first appeared.
3.5 billion years ago - The oldest fossils appear in the Western Arctic.
2.7 billion years ago - photosynthetic life emerges.
2.1 billion years ago - Coil-shaped fossil eukaryotes about 2 centimeters in diameter emerge.
1.2 billion years ago - Multicellular organisms emerge.
600 million years ago - Cambria explodes. (→Bazes fauna)
500 million years ago - fish appear. Plants and arthropods come to land.
400 million years ago - Amphibians came to land.
220 million years ago - The age of the dinosaurs begins.
200 million years ago - Mammals and birds appeared.