(Spanish) La teoria celular fue postulada por:
A) Robert Brown y Robert Hook
B) Theodor Shwann y Mattias Scheleiden
C) Zacharias Janssen y Mattias Scheleiden
D) Anton van Leeuwenhoek y Theodor Shwann

(In English!)

The cell theory was postulated by:
A) Robert Brown and Robert Hook
B) Theodor Shwann and Mattias Scheleiden
C) Zacharias Janssen and Mattias Scheleiden
D) Anton van Leeuwenhoek and Theodor Shwann

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.