WEIT Chap4

The Geography of Life

==Intro: The distribution of species around the world are surprisingly specific. In each place inhabitants live because they are adapted to their land. But also huge changements occured all along the years since the very first species, due to geological relations. We name it the biogeography. Nowadays, we justify biogeography with three important developements: -Information from DNA, and... -Continental drift,... -Molecular taxomony,...==

make a short introduction before digging the subjet [[ Utilisateur:Pierre.brawand|Pierre.brawand]] 19 avril 2011 à 22:45 (CEST)

Continents

What is convergent evolution?

Convergent evolution explains how two differents spieces that live in similar habitats can look and behave in the same way, because of their environment.
Convergent evolution proves three evolutionary theories:

1. Common ancestry, which explains the features shared (ou pas) between two infraclasses of mammals.

2. Speciation is the process by which a common ancestor can generate several different offsprings.

3. Natural selection expresses how each spieces adapted to its own environment.

How can similar species live in similar habitats but on different continents?

Indeed, although...

Islands

Darwin realised that islands play a very important role in the theory of evolution. Before we got to this evidence, we have to distinguish two types of islands: the continental and the oceanic ones.

What is a continental island?

...

What is the role of continental islands in the theory of evolution?

...

What is an oceanic island?

...

What is the role of oceanic islands in the theory of evolution?

...

AllanP 5 avril 2011 à 14:37 (CEST)
EstelleV 5 avril 2011 à 14:49 (CEST)
HéloiseD 7 avril 2011 à 11:09 (CEST)

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