Answer:
C. RNA
Explanation:
A primer of RNA is very much needed if someone is planning to go through the process of DNA replication.
Photosynthesis would be it what are your choices ?
Answer:
All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, growth and development, regulation, homeostasis, and energy processing. When viewed together, these characteristics serve to define life.
I don't know if this is what you are asking, but from largest to smallest:
Biosphere, ecosystem, community, population, organism (can be continued with organ systems, organs, tissues, cell)