Question

Give scientific reason why life of multicellular organism begins with singlecell.​

Answer 1

Answer:

One hypothesis is that it was predation that put selective pressure on single-celled organisms, causing them to become more complex. ... "Here we show that de novo origins of simple multicellularity can evolve in response to predation," the team write in their paper

Answer 2

All living organisms in their early developmental stages show the presence of following distinct features:

1) Development in sexually reproducing organisms begins from a single diploid cell stage that is a fertilized egg or zygote.

2) The zygote undergoes cleavage, blastulation, and gastrulation. At the end of gastrulation, three germ layers are formed which give rise to various organs and organ system.