How do the embryological development of different species reveal similarities of organisms that are not evident in the fully formed anatomy. Use the model to describe how scientists use patterns in embryology to show the relatedness of living things.

That the species evolved from a common ancestor. ... Descent with modification explains why organisms living today may be different from their ancestors,for example, by having different structures.

Explanation:

Studying the structures that develop during an embryo's various stages of growth is called embryology and can be used to show the genetic similarities that suggest certain patterns of evolution. Most embryos look similar in their early stages, but as they develop, the differences between species become more obvious.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.