The macromolecule that contains lots of Nitrogen atoms within it would be Nucleic Acids, either DNA or RNA.
Anaerobic plays a major role in keeping us alive.
The correct answer is emerging adulthood.
So the independent variable is the thing that is changed in an experiment and you want to change the amount of rainfall the cactus gets as the hypothesis is about rainfall so the answer would be c). Hope this helps :)
