IB Biology Topic A2.1.9 Evidence for the Evolution of the Last Universal Common Ancestor Revision Notes (HL)

IB Biology Topic A2.1.9 Evidence for the Evolution of the Last Universal Common Ancestor Revision Notes (HL) | RevisionDojo

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Ancient Hydrothermal Vents: A Window into Early Life

Hydrothermal vents are extraordinary environments where superheated water interacts with cold seawater, precipitating minerals like iron sulfides and silicates.
These unique conditions have preserved some of the oldest known evidence of life, dating back over 3.5 billion years.
Fossils found in these rocks provide critical clues about microbial life on early Earth.

Case study

Example

Strelley Pool Formation

The Strelley Pool Formation in Western Australia contains fossilized stromatolites, which are layered rock structures created by mats of microorganisms, likely cyanobacteria.
These stromatolites, dating back 3.42 billion years, are among the oldest uncontested evidence of life.
Their formation in shallow, sunlit waters suggests that microbial life had already diversified by this time.

Why Hydrothermal Vents?: Conditions That Favoured Early Life

LUCA’s genes suggest adaptation to an environment rich in:
1. Hydrogen gas (H₂)
2. Carbon dioxide (CO₂)
3. Iron compounds

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Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
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Ancient Hydrothermal Vents: A Window into Early Life

Hydrothermal vents are extraordinary environments where superheated water interacts with cold seawater, precipitating minerals like iron sulfides and silicates.
These unique conditions have preserved some of the oldest known evidence of life, dating back over 3.5 billion years.
Fossils found in these rocks provide critical clues about microbial life on early Earth.

Case study

Example

Strelley Pool Formation

The Strelley Pool Formation in Western Australia contains fossilized stromatolites, which are layered rock structures created by mats of microorganisms, likely cyanobacteria.
These stromatolites, dating back 3.42 billion years, are among the oldest uncontested evidence of life.
Their formation in shallow, sunlit waters suggests that microbial life had already diversified by this time.

Why Hydrothermal Vents?: Conditions That Favoured Early Life

LUCA’s genes suggest adaptation to an environment rich in:
1. Hydrogen gas (H₂)
2. Carbon dioxide (CO₂)
3. Iron compounds

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic A2.1.9: Evidence for the Evolution of the Last Universal Common Ancestor Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Ancient Hydrothermal Vents: A Window into Early Life

Why Hydrothermal Vents?: Conditions That Favoured Early Life

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Ancient Hydrothermal Vents: A Window into Early Life

Why Hydrothermal Vents?: Conditions That Favoured Early Life

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account