The image represents the structures found in a human bone. the cells which make up a bone are specialized to produce a substance called osteoid which hardens to become the extremely dense and strong material that make up the bones of the human skeleton. what primary purpose is met by these specialized bone cells?

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods. c. it shows that these organisms share the same habitat. d. it provides evidence that these organisms suffered a genetic mutation.