Why is is said that contour lines never cross? since a vertical cliff face has all elevations between top and bottom of the cliff coincident, thus all contour line meet. furthermore, when one gets an overhang, they do actually cross. lines of isobaric pressure, yes i can see that it would be impossible for these to cross, but contour lines? ? certainly not.

Where are the colloms

Conditions are more like living on  land  for creatures in the upper part of the intertidal, which is only covered with  water  at extreme high tide, so life is easier on land. conditions are more like living in the ocean for creatures in the lower part of the intertidal which is only exposed to air at extreme low tide. so basically it both worlds of land and ocean.

The average lifespan of a bear is 25 years