amoeba can change shape instantaneously
Paramecia are a group of unicellular ciliate protozoa also known as "slipper animalcules" from their slipper shape. See the link below for a photo.
The bacteria that can change shape call pleomorphic
Diatoms are eukaryotic, they are a major class of algae and the most common type of phytoplankton. They are unicellular yet exist in colonies in the shape of ribbons.
Protective Coloration
The need for a change itself. For example, the need to migrate in order to keep up with food sources would bring an organism into another territory that their bodies might not be adjusted to. Rather than dying off, the "fittest" organism of that breed might mate with another "fit" organism, and after - guessing - 20 generations or so, genetic changes will have made that territory the most suitable environment for that organism.
Amoeba or ameba, plural amoebae or amoebas: A single-celled (protozoan) organism that constantly changes shape. The word "ameba" is from the Greek "amoibe" meaning "change."
Constantly.
The amoeba is a type of an organism which is unicellular and has no definite shape. Amoeba came from the Greek word 'amibe' that means change.
A unicellular organism is made of only one cell, exists alone and performs all cell functions alone. Some examples include an Amoeba, Euglena, Paramecium
Paramecia are a group of unicellular ciliate protozoa also known as "slipper animalcules" from their slipper shape. See the link below for a photo.
A really dark green. It kind of looks like barf. 
The moon supposedly "changes shape" all the time, as the moon is constantly orbiting the Earth however the moon doesn't actually change shape, it is the amount of the sunlit side of the Earth that we see changing.
Unicellular organisms move in a variety of ways. Paramecia have cilia, which are tiny hairs that act like oars and propel the organism along. Bacteria move by rotating a flagellum that looks a bit like oars and propel the organism These organisms "swim" along. An amoeba moves by changing shape and forcing its cytoplasm into extensions called pseudopods. - s delacruz
naturalists referred to Amoeba as the Proteus animalcule after the Greek godProteus who could change his shape. The name "amibe" was given to it by Bory de Saint-Vincent,[3] from the Greek amoibè (αμοιβή), meaning change.[4]
Unicellular organisms move in a variety of ways. Paramecia have cilia, which are tiny hairs that act like oars and propel the organism along. Bacteria move by rotating a flagellum that looks a bit like oars and propel the organism These organisms "swim" along. An amoeba moves by changing shape and forcing its cytoplasm into extensions called pseudopods. - s delacruz
a manipulated trait is something that is changed in an organism after it is born, like if you change the shape of bamboo by bending it around something
Green, unicellular algae, some of which resemble a microscopic banana shape is a desmid.