While observing a special monitor, a doctor tells an expectant mother, 'As you can see, the legs and arms have just begun to emerge.' From this description, you should realise that the two are looking at a(n)

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The mention of arms and legs just beginning to emerge indicates that the developing organism is in the embryonic stage. A zygote is the fertilized egg before it begins to divide and develop into an embryo, while a germ disc refers specifically to the small cluster of cells that forms shortly after fertilization in mammals. A fetus is a more developed stage of development, when the basic structures of the body are already formed.

While Observing a Special Monitor, a Doctor Tells an Expectant