OHS2020 Chap3
Why are we only looking for fossiles in Africa and no elsewhere?
It's not true. There is other sites (look at the map at p.95 or 114).--AlinaM (discussion) 31 mars 2020 à 19:11 (CEST)
How does palaeomagnetism work ? (p.37)
Palaeomagnetism is a method which consists in estimating the age of fossils by analyzing and observing the alignment of particles in the deposit surrounding a particular fossil. This is possible because the Earth's magnetic field undergoes sequences of changes at different timings which allows magnetically charged particles to align themselves in function of the magnetic pole and to keep their orientation when they are consolidated into rock with fossils. That way by analyzing the position and orientation of different particles surrounding a fossil its age can be determined. --VictoriaW (discussion) 2 avril 2020 à 20:20 (CEST)
What are radiometric techniques used for ? (p.48)
Radiometric techniques are used to determine the age of volcanic deposits. By doing that, one can determine the age of the fossils that are found between the layers of ash. --IlliaB (discussion) 3 avril 2020 à 09:43 (CEST)
With what is sexual dimorphism linked to ? (p.61)
In primates, sexual dismorphism is expressed as "a ratio of average male body-weight to average female body-weight." By Humans, Bonobos and Chimpanzees the sexual dismorphism is pretty low in contrast with Gorillas for example who express a high sexual dismorphism. The cause of high sexual dismorphism is the social system in which male primates are in a competitive environnement with other males.--NoraM (discussion) 5 avril 2020 à 11:51 (CEST)
How did we discover tool-makers ? (p.68)
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What are the key adaptations of the humans hand to have great tool-making abilities ? (p.69)
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