20 ! answer ! a plant releases water through the stomata in its leaves. as water evaporates from the leaves, more water is pulled up from roots through the stem and into the leaves. this process is called transpiration and allows the plant to pull needed water and nutrients from the soil. you decide to do an experiment to determine how much water a plant can take up in a certain amount of time. what is your tested or measured variable? what are your controlled variables or what factors do you need to hold constant?

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.