When the corals and mollusks die, layers of their skeletons and shells form on the ocean floor. As the layers are buried by sediments, they compact and cement to form
limestone, which is a sedimentary rock made of calcium carbonate (Cacos)
There is one carbon atom and one hydrogen atom in the reactants for every three
carbon atoms and three hydrogen atoms in the products
There are two carbon atoms and two oxygen atoms in the reactants for every three
carbon atoms and three oxygen atoms in the products Option 4
There are three oxygen atoms in the reactants for every three oxygen atoms in the
products
There is one hydrogen atom in the reactants for every two hydrogen atoms in the
products

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.