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There are two ways to date fossil remains: relative dating and physical dating. The first method calculates the layers and the origin of the deposits on the fossil. The second method uses natural clocks (that use physical properties) to calculate how much time has passed since the organism has died. The most famous method is called radiocarbon dating which detects carbon-14 (which is a form of carbon). By measuring the amount of carbon-14 left in the deceased organism, we can determine when the organism died. Another technique that combines relative and physical dating is palaeomagnetism. It uses the Earth's magnetic poles and the position at which they were when the organism died, allowing us to calculate at which period of time that was. | There are two ways to date fossil remains: relative dating and physical dating. The first method calculates the layers and the origin of the deposits on the fossil. The second method uses natural clocks (that use physical properties) to calculate how much time has passed since the organism has died. The most famous method is called radiocarbon dating which detects carbon-14 (which is a form of carbon). By measuring the amount of carbon-14 left in the deceased organism, we can determine when the organism died. Another technique that combines relative and physical dating is palaeomagnetism. It uses the Earth's magnetic poles and the position at which they were when the organism died, allowing us to calculate at which period of time that was. | ||
= | =How do we know what previous hominins ate?= | ||
One method of knowing this is to analyse the types of plants found in the chemical compositions of hominin fossils, that biologists have classified into two main groups (by the way they photosynthesize), also known as C3 and C4 plants. Hominins who eat these plants will carry the respective signal of the plant in their body tissues and we now know that previous hominins used to eat a mainly C3 diet, because if they also ate C4 foods then this would mean they had a diversified diet and that they were living in a different type of environment. --[[Utilisateur:GavinC|GavinC]] ([[Discussion utilisateur:GavinC|discussion]]) 30 mars 2020 à 16:29 (CEST) | |||
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Version du 30 mars 2020 à 16:29
How to date fossil remains?
There are two ways to date fossil remains: relative dating and physical dating. The first method calculates the layers and the origin of the deposits on the fossil. The second method uses natural clocks (that use physical properties) to calculate how much time has passed since the organism has died. The most famous method is called radiocarbon dating which detects carbon-14 (which is a form of carbon). By measuring the amount of carbon-14 left in the deceased organism, we can determine when the organism died. Another technique that combines relative and physical dating is palaeomagnetism. It uses the Earth's magnetic poles and the position at which they were when the organism died, allowing us to calculate at which period of time that was.
How do we know what previous hominins ate?
One method of knowing this is to analyse the types of plants found in the chemical compositions of hominin fossils, that biologists have classified into two main groups (by the way they photosynthesize), also known as C3 and C4 plants. Hominins who eat these plants will carry the respective signal of the plant in their body tissues and we now know that previous hominins used to eat a mainly C3 diet, because if they also ate C4 foods then this would mean they had a diversified diet and that they were living in a different type of environment. --GavinC (discussion) 30 mars 2020 à 16:29 (CEST)
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