Question

how is embryo formed​

Answer 1

Answer:

due to fertilisation and zygote developement into foetus.

Answer 2

Answer:

This will help you

Each embryo starts development as a zygote, a single cell resulting from the fusion of gametes (i.e. fertilization of a female egg cell by a male sperm cell). ... Next, the cells in a blastula-stage embryo start rearranging themselves into layers in a process called gastrulation.

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