O2 is a Gas , we aspire it from the air
2<span>. the amount of G = the amount of C (pairing ratio of 1:1) c. the hydrogen bonds hold the molecule in its defintive shape. Complementary bases</span>
The answer is preserving biodiversity. It can be well-defined as the biological changeability among all living plants and animals of the earth as an outcome of the evolution procedures and contains of three levels of biological diversity which are genetic diversity, species diversity and ecosystem diversity.
D) when cells are express different genes
can be replenished over months, years, or decades.
