but it is landscape and climate together continually into change affecting how our brains became brame's what the key thing is if you think about living on africa you want fresh water you want to be able to have food etc and if those change or they drop off the menu you suddenly have to adapt and so that's what evolution is it's a way of basically changing organisms to actually cope with the rapid changes around you and actually one of the key things was asking smarter well i'll get to the brains of the 2nd but then what do you use this phrase climate rollercoasters what are climate rollercoasters and their influence on human habitation and all animal life so one of the interesting things is it's a real mixture of all the influences we got the tectonics uplifting africa and fragmenting it we then have changes in the way the earth what goes around the sun which changes the rainfall patterns in east africa so we suddenly get wet periods and then dry periods which fill up these huge lakes in east africa and then they disappear and it's that stress that rapid stress that roller coaster or of