Read the following scenarios. Then explain how natural selection could occur in each. Include the four principles of natural selection (overproduction of offspring, adaptation, variation, and descent with modification) as well as what condition(s) drive natural selection. 3. . Polar bears tend to have varying thickness in coats: some are
thin, some are medium, and some are thick. Due to global
warming, temperatures have been slowly rising over time. Most
of the bears have 2 cubs a breeding season, but only 1 survives
the changing temperatures.

One of the newest applications of cell technology is called cybrid embryos. this process involves replacing the nuclear material of an animal cell with human nuclear material. how might this process affect public policies about research by using stem cells? the same policies and concerns about the use of human embryonic stem cells would most likely apply. the embryos would most likely be treated like traditional animal embryos and regulated accordingly. the process of forming cybrid embryos would most likely be banned by government regulators. the embryos would be treated as regular cells because they are not fully human in origin.