nmdcat.online
BIO NMDCAT Concept of Evolution
nmdcat.online July 14, 2026

39. A scientist discovers fossil evidence showing that anaerobic microorganisms existed before oxygen-producing organisms. This finding supports the idea that:

A. Oxygen-rich conditions existed before life.
B. Early life evolved in an oxygen-deficient environment.
✓
C. Plants were the earliest organisms.
D. Eukaryotes appeared before prokaryotes.

📝 Explanation

Correct: Anaerobic organisms indicate that free oxygen was absent initially. A: Contradicted by fossil evidence. C: Plants evolved much later. D: Prokaryotes evolved before eukaryotes. Concept: Evolutionary evidence.

📖 Additional Information

  • Oxygen-rich conditions existed before life.
  • Early life evolved in an oxygen-deficient environment.
  • Plants were the earliest organisms.
  • Eukaryotes appeared before prokaryotes.

Correct: Anaerobic organisms indicate that free oxygen was absent initially. A: Contradicted by fossil evidence. C: Plants evolved much later. D: Prokaryotes evolved before eukaryotes. Concept: Evolutionary evidence.

🔗 Share This Question

Facebook Twitter LinkedIn WhatsApp

🧭 Navigate Questions

Previous Question

38. Which conclusion about the Miller-Urey experiment is scientifically valid?

Next Question

40. Which statement best summarizes the current scientific explanation for the origin of life?

Back to All Questions

🔗 Related MCQs

An increase in the incidence of ectopic pregnancies within a population can often be epidemiologically correlated with a prior increase in the prevalence of which sexually transmitted disease?
July 16, 2026
In the life cycle of Herpes Simplex Virus 2 (HSV-2), the virus travels along nerve fibers to reach the sensory ganglia. The cellular mechanism responsible for this retrograde transport utilizes:
July 16, 2026
A defining characteristic of the lesions associated with the secondary stage of syphilis is that they:
July 16, 2026
The causative agent of genital herpes, HSV-2, is enveloped. The biological significance of this viral envelope in the context of transmission is that it makes the virus:
July 16, 2026
The structural basis for the severe cardiovascular complications seen in tertiary syphilis, such as aortic aneurysms, is the chronic inflammation and destruction of:
July 16, 2026

Categories

View all →