Sumaya is using two different strings of Christmas lights to decorate her house. one string flashes every 10 seconds. the other one string flashes every 15 seconds. when Sumaya turns on the lights they flashes at the same time. work out how long it will be before they flash again at the same time. use the LCM to help you work out your answer​

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.