ANATOMY

Detailed explanation-1: -Why do scientists compare embryos of different organisms? 1 To identify similarities in structure that are not present when the organisms become adults. 2 To determine evolutionary relationships between organisms based on structures that are present in embryos.

Detailed explanation-2: -Scientists look at embryos of different species to see how closely related they are. Species that share a recent common ancestor will develop in similar ways.

Detailed explanation-3: -Comparative embryology shows similarities between organisms that do not appear to be similar as adults because many features of embryos disappear by adulthood. For example, all vertebrate embryos have a tail and gill slits, but these disappear by adulthood in many vertebrates, including humans.

Detailed explanation-4: -Scientists can compare the DNA of two organisms; the more similar the DNA, the more closely related the organisms. This method can also help when looks are deceptive. One example of looks being deceptive is: The bat and the crow both have wings, and the squirrel does not.

Detailed explanation-5: -Comparative embryology is the branch of embryology that compares and contrasts embryos of different species, showing how all animals are related.