If the sentences after the question are multiple-choice, I believe it is the second sentence (New information is discovered that contradicts the existing theory).
Answer:
Explanation:
Define key words/vocab words to solve.
Sometimes you have to define words in the definition too :-P
chemosynthesis - the synthesis of organic compounds by bacteria or other living organisms using energy derived from reactions involving inorganic chemicals, typically in the absence of sunlight.
maybe easier to understand below:
Chemosynthesis is the process by which food (glucose) is made by bacteria using chemicals as the energy source, rather than sunlight. Chemosynthesis occurs around hydrothermal vents and methane seeps in the deep sea where sunlight is absent.
