Finding the complimentary bases always follows the same rules- the only difference is the use of uracil "U" instead of thymine "T"... so instead of replacing "A" adenine with "T" thymine, we replace it with "U" uracil
I believe the answer is C. because when the dinosaurs thrived they ate most of the mammals which were small animals but when the dinosaurs went extinct the mammals grew larger in size and started to thrive.
