Answer:
Use of a drug selection eliminates those stem cells with nonhomologous recombination products. (mouse)
Viral vectors, microinjection, T-DNA, electroporation, and biolistic transfer. (fruits and veggies)
Used a nucleus from a terminally differentiated cell type. (sheep)
Created using constituitively expressed DNA from genetically unrelated species. (fish)
^^^ ANSWERS ARE IN PARENTHESES ^^^
Oil and natural gas result from the decomposition of microscopic marine plants and animals which lived in the geological past times, tens of millions years ago. When these creatures died they accumulated on the sea floor and got covered under new layers of sediments. As they become buried deeper and deeper, heat and pressure began to rise transforming this biomass into oil and gas.
They help form D organ system which is the
digestive system
The chemical originally contained in aerosol propellants that is thought to have contributed to the depletion of the ozone layer is the chlorofluorocarbons or the CFCs. These are nonflammable and nontoxic substances that has carbon, chlorine and fluorine in their structure. These substances are used as propellants, solvents and as refrigerants. However, it was found from researches that these substances would contribute to the depletion of the ozone layer in the atmosphere which is why under the Montreal Protocol, the use of these are banned and other alternatives are being used now in replace with the CFC. One alternative used is the <span>hydrofluorocarbons.</span>
