In the Arctic, pollutants banned from the U.S. in 1979 but still floating around the environment seem to be affecting the strength of polar bear penile bones, possibly compromising the ability of the ...

A travel graph is a line graph which describes a journey – it shows how distance changes with time. The distance is always distance from a particular place and the time is the time from the start of ...

Real life situations such as travelling over time and across distance can be drawn on a graph. Exact distances and times are plotted on the graph. These are shown as co-ordinates. These points are ...