All life starts as
(a) an egg
(b) a single cell
(c) a gene
(d) a chromosome
The life of every living organism begins from a single cell. E.g. The life of a mango tree began from a mango seed. The mango seed had an embryo, which also started as a single cell in the ovary of flower of the parent mango tree. Therefore, it is said that, 'All life starts as a single cell'
option b is correct