What is the effect on the subsequent development of the body of changes in the later stages of embryo formation?

What is the effect on the subsequent development of the body of changes in the later stages of embryo formation? Why can these changes be even favorable?

Changes in the later stages of development affect less significant symptoms and may even be favorable for the body, being picked up in these cases by natural selection. Such changes can occur during the development of embryos in changing environmental conditions and have a positive effect on the adaptation of the organism in them.

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