Where do the plants come from during succession?

Why Eventually seeds that were buried hundreds
of miles below Earth's crust will work their
way to the surface over thousands of
years, and sprout.

The wind blows seeds great distances, seed
pods float down streams, animals also eat
fruits and vegetables depositing those seeds
when they poop.

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.