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L25: Major Biotic Changes Through Time

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (24)

#1
Front (Question)

what were the big 5 mass extinctions? (chronological order)

Back (Answer)

terminal-Ordovician terminal-Devonian terminal-Permian terminal-Triassic terminal-Cretaceous

#2
Front (Question)

what was the biggest mass extinction?

Back (Answer)

terminal-Permian

#3
Front (Question)

when was the terminal-Permian mass extinction?

Back (Answer)

252 Ma

#4
Front (Question)

what was the smallest masse extinction?

Back (Answer)

terminal-Devonian

#5
Front (Question)

what do the 5 mass extinctions coincide with?

Back (Answer)

boundaries between major chunks of defined geological time

#6
Front (Question)

how could these chunks of time be defined historically?

Back (Answer)

changes of the content of the fossil record

#7
Front (Question)

when did the oldest mass extinction occur?

Back (Answer)

444 Ma

#8
Front (Question)

when did the most recent masse extinction event occur?

Back (Answer)

66 Ma

#9
Front (Question)

what is the most celebrated mass extinction?

Back (Answer)

terminal-Cretaceous

#10
Front (Question)

what is anther name given to the terminal-Cretaceous

Back (Answer)

K/T boundary

#11
Front (Question)

what is the meaning of a mass extinction event?

Back (Answer)

widespread and rapid decrease in biodiversity to the rate of speciation

#12
Front (Question)

what is a mass extinction usually identified by?

Back (Answer)

an abrupt reduction in the diversity an abundance of multicellular organisms

#13
Front (Question)

what is another term for a mass extinction event?

Back (Answer)

a biotic crisis

#14
Front (Question)

what is another term for evolutionary adaptive speciations?

Back (Answer)

speciation rate

#15
Front (Question)

what is the meaning of evolutionary adaptive radiations?

Back (Answer)

process in which organisms diversify rapidly from an ancestral species into a multitude of new forms

#16
Front (Question)

when do evolutionary adaptive radiations more commonly occur?

Back (Answer)

following a change in the environment which makes new resources available, create new challenges, or opens new environmental niches

#17
Front (Question)

what are extinction records more biased to?

Back (Answer)

easily observed, easy preserved and biologically complex components of the biosphere compared to microbial life which accounts for the bulk of Earth’s biomass (less fully complete record)

#18
Front (Question)

extinction events are identified as an increase against the background rate of extinction of … to … taxonomic families per million years

Back (Answer)

2 5

#19
Front (Question)

are terrestrial or marine records more complete?

Back (Answer)

marine

#20
Front (Question)

when was the great oxidation event?

Back (Answer)

2.4 Ba

#21
Front (Question)

what did the great oxidation event result from?

Back (Answer)

the evolution of photosynthesising bacteria

#22
Front (Question)

what is the great oxidation event represented by in the geological record?

Back (Answer)

by the first appearance of red beds

#23
Front (Question)

what caused the formation of red beds?

Back (Answer)

the oxidation of iron-rich minerals (rusting)

#24
Front (Question)

what was the great oxidation event likely a mass extinction of? and why?

Back (Answer)

microbial communities as would have not been adapted to the high oxygen content in the atmosphere