Create a Venn Diagram comparing and contrasting Primary Succession to Secondary Succession using the phrases below:
*starts with previously existing soil
*gradual growth
*happens relatively fast
*happens relatively slow
*lichens break down rock
*starts on bare rock
*Pioneer species
*previously existing life
*no previously existing life
*starts as the result of a volcano or receding glacier
*starts as the result of a forest fire or flood
*climax community
*comes after a natural disaster
*plants and animals adapt

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.