This graph plots extinction rates of marine animal families over the last 600 million years. The shaded band indicates the normal range of extinction rates, known as "background extinction." ...

These graphs also show if the object is moving at a constant speed or accelerating, going back to the starting point, or stationary. Constant speed is shown by a straight rising line. The gradient ...

A distance-time graph shows how the distance travelled by an object changes over time and can be used to calculate the speed of the object. A sloping line on a distance-time graph shows that the ...

North Atlantic right whales are in a dangerous position with less than 360 surviving in the wild, but a new proposed speed limit could ... now that the risk of extinction is very real," Jessica ...