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Quelele Rodriguz

on 8 November 2013

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Single-Celled Organisms
What is this
A unicellular organism , also known as a single-celled organism , is an organism that consists of only one cell , unlike a multicellular organism that consists of multiple cells. Historically the simple single celled organisms have sometimes been referred to as monads . The main groups of unicellular organisms are bacteria, archaea , protozoa , unicellular algae and unicellular fungi. Unicellular organisms fall into two general categories : prokaryotic organisms and eukaryotic organisms . Unicellular organisms are believed to be the oldest form of life , possibly existing 3 . 8 billion years ago .
Getting food
All organisms need energy . Some , like plants , make their own food .
Others take in or eat food from the outside.
Single - celled organisms get food in diferent ways .
For example : an amoeba esthetches.
Interactions with larger Organisms
Single - celled organisms are all around you . Sometimes their effects are helpful , while at other times they are harmful .
In science, diffusion refers to the movement of molecules from a region of higher concentration to one of lower concentration by random molecular motion. According to most scientists, diffusion can still occur in places where the concentration gradient is absent. Diffusion is normally applied in social sciences to describe the spread of ideas
Some single - celled organisms are able to move from place to place , much like animals do . Movement enables an organisms to find food and shelter , or to escape predators . The amoeba moves by pushing its membrane forward .
Organisms must produce more of their kind if the species is to survive . The process is called reproduction . Single-Celled organisms reproduce in diferents ways .
Life as a single cell
All living things have the same basic needs . They need to take in food and get rid of wastes . They to digest nutrients so they can use and store energy . They also need to grow and reproduce . Single - celled organisms carry out all of their life processes whithin one cell.
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