Answer:
The primary organisms involved in the process of <u>(</u><u>b</u><u>.</u><u>)</u><u> </u><u>d</u><u>e</u><u>c</u><u>a</u><u>y</u> are bacteria and fungi.
Answer: Single cell organisms dont need a respiratory system because oxygen and carbon-dioxe diffuses between their body tissues and the enviorment.
It is called the homeostasis.
Homeostasis is the living organism's mechanism to maintain and sustain its internal environment at the level where it will suffice for them to survive. This process involves the pulling and pushing of delinquencies and extremities with an organism.