👉 The term "theriomorphosis" refers to a specific phase of embryonic development in which cells from different organ systems develop into individual organs or tissues. This process is often referred to as "theriomorphogenesis," and it occurs during the first few weeks after fertilization, when embryos are still developing from an egg. The specific stages of this process can vary depending on the species being studied, but it involves a combination of cell division, differentiation, and organ formation.