How are fitus evidence of evolution?

Answer 1

I'm assuming you meant fetus. A fetuses of most of the animal kingdom are identical in the early stages for example there is a time period where someone could not visually identify the differences between a developing human and a developing chicken. As the human fetus progresses it will no longer resemble a developing chicken but will still be similar to other mammals fetuses until the final stages of development. A growing fetus at certain stages will have a tail, webbed fingers, and gills all of which once fully developed are no longer there because we have evolved to no longer have a use for them unlike our ancient ancestors.