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Key Concepts: Adaptive Radiation & Cambrian Explosion in Life's History, Quizzes of Biology

Explore the history of life through the lenses of adaptive radiation and the cambrian explosion. Learn about the definitions, mechanisms, and causes of these biological phenomena. Discover how adaptive radiation leads to the production of diverse species and how the cambrian explosion marked a significant turning point in the evolution of complex organisms.

Typology: Quizzes

2011/2012

Uploaded on 02/04/2012

melalala123
melalala123 🇺🇸

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TERM 1
2 important points to study when considering
the history of life
DEFINITION 1
1. periods when species originate and diversify rapidly2.
periods when species go extinct rapidly
TERM 2
adaptive radiation
DEFINITION 2
when a single lineage produces many descendant species
that live in a wide diversity of habitats and use a wide array
of resourcese.g. the Hawaiian silverwoods
TERM 3
the 3 hallmarks of adaptive radiation
DEFINITION 3
1. they are a monophyletic group2. they are speciated
rapidly3. they are diversified ecologically (in terms of the
resources they useand the habits they occupy)
TERM 4
two general mechanisms that can trigger
adaptive radiations
DEFINITION 4
1. new resources2. new ways to exploit resources
TERM 5
niche
DEFINITION 5
the range of resources that a species can use and the range
of conditions that it can tolerate
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TERM 1

2 important points to study when considering

the history of life

DEFINITION 1

  1. periods when species originate and diversify rapidly2. periods when species go extinct rapidly TERM 2

adaptive radiation

DEFINITION 2 when a single lineage produces many descendant species that live in a wide diversity of habitats and use a wide array of resourcese.g. the Hawaiian silverwoods TERM 3

the 3 hallmarks of adaptive radiation

DEFINITION 3

  1. they are a monophyletic group2. they are speciated rapidly3. they are diversified ecologically (in terms of the resources they useand the habits they occupy) TERM 4

two general mechanisms that can trigger

adaptive radiations

DEFINITION 4

  1. new resources2. new ways to exploit resources TERM 5

niche

DEFINITION 5 the range of resources that a species can use and the range of conditions that it can tolerate

TERM 6

ecological opportunity

DEFINITION 6 meaning the availability of new or novel types of resourceshas driven a wide array of adaptive radiations TERM 7

the evolution of a key morphological traits

allowed descendants to:

DEFINITION 7

  1. live in new areas2. exploit new sources of food OR3. move in new ways*it triggered many of the important diversification events in the history of lifee.g. the evolution of wings, reproductive structure of angiosperms, chichlids (fish that evolved a unique set of jaws in their throats), feathers and wings give some dinosaurs the ability to fly TERM 8

Cambrian Explosion

DEFINITION 8 the evolution of creatures with shells, exoskeletons, internal skeletons, legs, heads, tails, eyes, antennae, jaw-like mandibles, segmented bodies, muscles, and brains during the Cambrian perioddocumented by 3 major fossil assemblages (1) 570 mya, (2) at 565 to 542 mya, and (3) at 525 to 515 mya TERM 9

fauna

DEFINITION 9 a collection of animal species TERM 10

theories as to what triggered the Cambrian

explosion

DEFINITION 10

  1. higher oxygen levels2. the evolution of predation3. new niches beget more new niches4. new genes, new bodies**** most/all of these hypotheses could be correct. they are not mutually exclusive****