The processes leading up to the birth of a newborn baby can be divided into several stages. review the stages listed in the prompt. order them, starting immediately after fertilization. a) embryo - fetus - infant - zygote b) zygote - fetus - embryo - infant c) zygote - embryo - fetus - infant d) embryo - fetus - infant - zygote

The correct answer is -

C) zygote - embryo - fetus - infant.

In placental mammals (such as human beings), the haploid sex cell (gametes, such as sperm and egg) produced by each parent are fused to produce diploid zygote, which undergoes multiple rounds of cell division (mitosis) and goes through different stages (such as embryo, which is from conception till 8th week of pregnancy).

Embryo is further developed into more advanced stage (that is fetus, which is considered from 8th week till birth of baby) when the cells are still undergoing proliferation and differentiation to form specialised organs.

New born baby upto two years of age is considered as infant.

Thus, option C) is the right answer.

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