What is the best description of organisms of the precambrian era?
a . land plants and animals
b . dinosaurs and primates pice mammals
c . single celled organisms and soft, boneless animals
d . ferns and flying reptiles

Option C, Single celled organisms and soft, boneless animals

Explanation:

The Precambrian era refers to the first geologic time frame and thus it refers to  time frame which is some billion years old. During Archean period of Precambrian era,  single celled /unicellular and simple form of organisms originated such as protozoans (including amoeba, euglena, and paramecium). These organisms developed with time and by the late Precambrian era soft bodied multi-cellular organisms like jellyfish, worms . moss etc. originated.  

then that particular organisms become extinct.

explanation: