you are correct, it would be D. i hope this helps you out!
The correct answer is "wildlife sanctuary"
These sanctuaries are places that emulate conditions met in natural habitats that are long gone and thus the animals that live in them have a place to live freely and survive.
The answer is c. oxygen.
Cellular respiration includes glycolysis, link reaction, Krebs cycle, and electron transport chain (ETC), in that order. The main function of ETC is a production of ATP. In this series of oxidation-reduction reactions, electrons from the previous stages of cellular respiration are taken and transported to the oxygen which is the final acceptor of electrons. As the result, water and ATP are produced.
The answer to your question is
x-rays