DNA is composed of two complementary strands. This is reflected in the fact that O
А
the number last cytosines (C) in one strand is always double the number of guanines (G) in the other strand.
B
the number of guanines (G) in one strand is always equal to the number of adenines (A) in the other strand
С
the number of thymines (T) in one strand is always double the number of cytosines (C) in the other strand
D
the number of adenines (A) in one strand is always equal to the number of thymines (T) in the other strand

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.