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Blueprint of Life

Biology

38 Pages Complete Study Notes Year: Pre-2018

Blueprint of Life HSC Biology - HSC Syllabus Notes 1. Evidence of evolution suggests that the mechanisms of inheritance, accompanied by selection, allow change over many generations Outline the impact on the evolution of plants and animals of: − Changes in physical conditions in the environment −Changes in chemical conditions in the environment − Competition for resources ! Changes in physical conditions in the environment - Physical Changes Include: temperature, wind, light availability and rainfall. - Over the past 25 million years the earth has drifted north due to plate tectonics and have thus caused Australia to become more hotter and drier. - The hotter environment decreased the Antarctic beach rain forest and an increased in sclerophyll woodlands and grasslands. - This physical change has had an impact on the kangaroo species. - The kangaroo used to be very small with generalized molars however due to the hot environment it has caused it to become much larger in size and has specialized high crest molars to help it eat grasses where as before it ate shrubs. Their number of toes has decreased but the toe length has increased to allow it to travel at greater speeds. - Also due to the frequent bushfires due to lightening strikes, hot temperatures and Aboriginal land management, certain plants adapted to hot temperatures will survive ! whereas other will become extinct.


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