What is the function of each lymph organ?
organ in which macrophages
break down old blood cells and
bacteria or viruses
organ where lymphocytes are
synthesized, developed,
and matured
organ that acts as the first line of
defense in the nasal and oral cavity
organ where a special lymphocyle
that aids the immune system
is activated
spleen
thymus
red bone marrow

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.