5. Which statement best explains why embryology is useful: A. Comparing embryos may reveal evolutionary relationships.
B. Embryos are usually well preserved as fossils.
C. Embryos undergo a series of metamorphic changes.
D. Embryos are stages found in only closely related species.

amber has allowed scientists to study dna that has been preserved over millions of years.

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they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.