Practice mode Evolution

The early atmosphere assumed in the Oparin-Haldane hypothesis is best described as ____.

Correct answer D. reducing, with little or no free oxygen

Explanation

Oparin and Haldane proposed a reducing primitive atmosphere lacking free O₂. Without oxygen, newly formed organic molecules would not be oxidised and could accumulate in the oceans.

Report a problem

Answer checked 11 October 2026 How we write and check questions

Tip: press A, B, C or D to answer, and N for the next question.

The early atmosphere assumed in the Oparin-Haldane hypothesis is best described as ____.

Discussion

Have a question about this answer? Cancel reply

The early atmosphere assumed in the Oparin-Haldane hypothesis is best described as ____.

More Evolution questions

A natural disaster kills most of a population at random, leaving a few survivors with reduced genetic diversity. This is known as ____.

A few individuals colonise a new island and the new population has allele frequencies very different from the mainland. This is called ____.

The biological species concept defines a species as a group of organisms that ____.

Many new plant species have arisen in a single generation without geographical isolation. The most common mechanism is ____.

Discussion

Have a question about this answer? Cancel reply