The best choice is D prokaryotes dont have a nucleus <span />
1, O because if either shows present it's O.
I would asy thd answer would be d if its not my bad .
The answer to your question would be space. The sun's light travles through space. but if you clap, you can't hear it.
I believe that an adjuvant is a chemical addictive that increases the effectiveness of vaccines. It is a pharmacological or immunological agent that modifies the effect of other agents. It may be added to a vaccine to modify the immune response by boosting it such as to give a higher amount of antibodies and a longer lasting protection, and hence minimizing the amount of the foreign material or vaccine injected.