4. what does the tree of life represent? (1 point) a. the current hypothesis of the evolutionary relationships between organisms b. the relationship between different taxa in the three domains based on dna evidence c. the linnaean relationships between kingdom, phylum, class, order, family, genus, and species d. only the clades that include living organisms

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.