Answer:
Step-by-step explanation:
The first evidence of multicellularity is from cyanobacteria-like organisms that lived 3–3.5 billion years ago.
how they survive
The cell proliferates to produce many more cells that result in the multicellular organism. The process starts with a single fertilized cell that increasingly divides to form many more cells. In the process, the genome causes the cells specialize through selective gene expression.