Psychology 3221F/G Lecture Notes - Lecture 2: Sinornithosaurus, Euphonia, Sinosauropteryx

• School: Western University
• Department: Psychology
• Course: Psychology 3221F/G
• Professor: Sherry

Document Summary

Euphonia (have minor variations but all part of same group very different from other bird. We know why man-made objects occur in groups (because we made them), but why are living things also hierarchically organized: e. g. difference b/w string instruments. One pair of adult salmon produce 2,000 - 5,000 fertilized eggs. Population of salmon is not increasing by 2-5k every generation it doesn"t increase at all: so, by the time the baby reaches adulthood, only 2 will make it and they will replace their parents. This could have to with immune system, ability to find food, navigate in the sea has to do with who survives. The birds in the pic are actually related together by common descent: adaptation: results from selection for behaviour and morphology that increase reproductive success by serving a specific function. Increase in frequency of the variation that makes a positive contribution to reproductive success.