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which of the following describes how dna provides evidence to support that life changes o...
Biology, 29.12.2019 06:31 elijahedgar876
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which of the following describes how dna provides evidence to support that life changes over time?
a) some animals exhibit similar stages of embryonic development.
b) some animals exhibit structures that are no longer used for any purpose.
c) some animals exhibit similar biological proteins.
d) some animals exhibit similar structures, possibly due to a common ancestor.
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Embryonic stem cells are cells derived from an embryo. these cells can be used to create new tissues for patients suffering from certain illnesses and disorders. which statement best summarizes why the use of embryonic stem cells could be seen as unethical? a. some people consider embryos to possess rights equal to those of fully developed human beings. b. extracting stem cells from embryos is a very energy-intensive process, which consumes resources that could be used elsewhere. c. embryos are difficult to obtain, so the monetary cost of using them for research outweighs their benefit. d. the process of extracting stem cells from embryos generates biohazardous waste that cannot be safely disposed of.
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