Because they do not have an immune system, don't have noses, don't have mouths, and just plain do not have the same functions as animals, insects, or humans. They don't have a heart or a brain, which means they can't catch a cold. They can get diseases however.
Answer:
Option C
Explanation:
The cyanobacteria is the oldest life form that once existed on planet earth some 3.7 billion years ago. These cyanobacteria formed layered structures fossils which are called as stromatolites
Hence, stromatolites are the fossilized colonies of cyanobacteria.
A set of rocks in Greenland show the evidence of cyanobacteria as a living organism.
These stromatolites have layered structure of bio-chemical accretionary that are produced by trapping sedimentary grains through biofilms of microorganisms such as cyanobacteria.
Hence, option C is correct
The differences in populations are
(Colors)
(Look)
(Shape)
And (Form)
The slight color can be important because of camouflage.
The color can also make the organism look like a different animal.
Lets put snakes for example...
there are also some harmless snakes that are often confused with the coral snake, the shovel-nose snake, the scarlet kingsnake, the Florida scarlet snake, the Pueblan Milk Snake, and other snakes that look like coral snakes.
They do this so they look like a very dangerous animal and dont get hunted.
