Over Geologic Time, the Concentration of O₂ in Earth's Atmosphere

question 124

Multiple Choice

Over geologic time, the concentration of O₂ in Earth's atmosphere has increased. During the _______ period, the O₂ concentration decreased significantly and resulted in _______.

• A) Devonian; rapid evolution of lineages
• B) Carboniferous; mass extinctions
• C) Permian; mass extinctions
• D) Cretaceous; rapid evolution of lineages
• E) Cretaceous; mass extinctions

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Definitions:

Soy Sauce

A dark, salty liquid condiment, traditionally made by fermenting soybeans and wheat, used in various cuisines, particularly East Asian and Southeast Asian.

Conjunctions

Words that connect clauses, sentences, or words in a sentence, such as "and", "but", and "or".

Punctuated Correctly

The use of correct punctuation marks in writing to clarify meaning and indicate sentence structure.

Conjunctions

Terms that link clauses or sentences together, or coordinate words within the same clause, like "and," "but," and "if."