The second one I believe.
The earth has layers and is composed of four layers. The
four layers of the earth are namely, crust, mantle, the outer core and the
inner core. The core in the layers of the earth serves as the central region.
The mantle is the earth’s solid bulk in terms of its interior. The inner and
outer core are composed minerals and are the third and fourth layer in the
earth.
RNA stands for ribonucleic acid which is one type of nucleic acids. So nucleic acid has RNA.
I think it's b. Or c. Sorry if it's wrong but I'm pretty sure it's one of those
nuclear energy<span> is considered as one of the most environmentally friendly source of </span>energy<span> as it produces fewer greenhouse gas emissions during the production of electricity as compared to traditional sources like coal </span>power<span> plants.</span>
