Answer:
Earth, Mars
Explanation:
Earth is the only planet on which life is known to exist. Water on earth exists in all three forms
Presence of water on Mars was recently confirmed. Though liquid water is no more present, in solid form, water is present in polar ice caps.
It allows scientists to explore new explanations for observations.
Lack of water would have an impact on the level of glucose produced hence decreasing the energy level that will finally be produced.
Answer: c. molecular structure of DNA
