Which of the Following Did Early Methanogens Use from the Early

question 17

Multiple Choice

Which of the following did early methanogens use from the early atmosphere to generate energy?

• A) CO₂ and H₂
• B) H₂O and O₂
• C) CH₄ and CO₂
• D) N₂ and O₃
• E) O₂ and H₂

---

Definitions:

Chronosystem

is a concept in ecological systems theory representing the dimension of time, including life transitions, events, and historical contexts that impact development.

Historical Generation

A group of people strongly influenced by a major historical event during their formative period.

Nonnormative Life Events

Unusual occurrences that have a significant impact on an individual's life but do not follow a predictable timing in the lifespan.

Normative Age-Graded

Refers to the universal life events that occur at typical ages, shaping individual development.