Question
Life of multicellular organism begins with single cell.

Answer

$-$Generally sexual reproduction occurs in multicellular organisms.
$-$Zygote is formed by fertilization of egg cell in sexual reproduction.
$-$Zygote in unicellular.
$-$The fertilised egg cell $($zygote$)$ multiplies and the number of cells increase as development proceeds.
$-$Thus, multicellular organism is formed.
$-$So, an organism with millions of cells begins life as a single cell. i.e. zygote.

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