ANSWER IS : A troposphere
Restriction enzymes are enzymes used as cutting tools in making recombinant DNA. They are also called restriction endonuclease, a protein produced by bacteria that cleaves DNA at specific sites along the molecule. In a bacteria cell they cleave foreign DNA, thus eliminating infecting organisms.
I believe D because non of the answers above are reality, humans are great at living in different types of environments and even tend to change there environment.
<span>The correct answer is attenuated live vaccine.</span>
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Attenuated live vaccines are vaccines that use a weakened or attenuated form of the viruses or bacteria that causes a disease. Viruses or bacteria are given in a relatively small dose to replicate in the vaccinated person and to stimulate an immune response. They create a strong and long-lasting immune response but the limiting factor is that there is a possibility for a virus to revert to a form which is capable of causing disease.</span>
