I am pretty sure it's D) use of electrons focused by magnetic fields.
A bonds with T in DNA
A bonds with U in RNA
G bonds with C IN DNA
In RNA, the only difference with the code is uracil takes thymines place
The answer is b. blood, Blood is considered a tissue even though it is liquid.
The Geological Era ''Mesozoic'' is known as the age of reptiles, dinosaurs and other huge reptiles roamed earth in this era. I hope this helps.