This are organisms that exist in there single firm or colony. We're ever we go were ever we leave they are there, they even reside in our system. Many could be harmful, infection in human is caused by micro organisms, and could be divided into 6 types this are bacteria,archaea, fungi, protozoa, algae, and virus.
Thus, we are going to be talking about bacteria basically. 
BACTERIA.
they are large prokaryotic organism and they range in shape some are spherical, rod like and spiral.
SHAPE OF BACTERIA.
- BACILLI: They are rod shaped cells.
- COCCI: They are spherical or oval shaped cells.
- VIBRIOUS: They are comma shaped bacterials.
- SPIRILLI: This one's are rigid spiral forms.
- SPIROCHELES: This are flexus spiral form.
- FILAMENTUS BACTERIA: Actinomycetes are branching filaments Bacteria's.
- ARMOPHOUS: microplasma are bacteria's that do not have call wall and hence they do not have a stable morphology.
BACTERIA MOPHOLOGY.
On the basis of shape bacteria can be grouped into several types the generic name usually indicate the shape and arrangement of cells.
I. COCCI: they are spherical cells occuring either singly or in groups. This feature is useful in identification they are usually small (0.5 to1.5mm i n diameter). 
DIFFERENT GROUP.
a. Monococcus: Single cells
b. Diplococcus: They occur in pairs of cells.
c. Streptococcus: Chains formedi.eoccur in Chains.
d. Staphylococci: Cells dividing in random plains (appear like star).
e. Sarcina: Dividing in tree regular plane forming cubical group.
II. BACILLI: they are rod shaped cells usually occuring singly sometimes in chains, generally they are (1.0-6.00microdiametre) and (0.5-1.5cm in diameter). The shape also varies with ends being flat rounded,or cigar shape ( bacillus clostridium). 
III. VIBRIOUS: They are rod shaped cells with distinct coveture appearing like o comma, or a twisted rod e.g Vibrio cholerae. 
IV.SPIRAL: They are long slender cells twisted into spirals or helical shapes they are called "spirilli" or " spirochaete" if (flexible) many numbers are 2.0-4.0mm long and 0.25mm thick but some are very long reaching up to 250mm in length. 
Other shapes include, actinomycetes (develops long filament forming rudimentaries or well developed mycelia), corynabacteria ( have irregular shapes of cells appearing to be modified rod shaped form), cyanobacteria ( develops large cells up to 7.0mm in diameter which may occur singly or in branched filaments called TRICHOMES. The microplasma lack cell wall and shows variation in shape. Some forms are said to be " pleomorphic").
TYPE OF BACTERIA NUTRIENT.
1.Autotrophs( a type of feeding were the organism produces it's on food trough the help of photosynthesis).
Heterotrophs( this type of nutrition requires the organism to feet on dead decayed organic materials. Common in saprophitic bacterias)
Chemotroph(this are bacterias that feed from it surrounding chemicals and converting it into energy ATP ( adenosine triphosphate).
This are little from what I know about bacteria. Tomorrow we would be looking at "archaea"