When moving upward on an energy pyramid from one level to the next, what happens to the usable energy in an
ecosystem?
Olt increases by about 10%.
O It increases by about 90%.
O li decreases by about 10%
Oli decreases by about 90%.

Its in the national history museum and you can't se the original because its locked away in a vault 

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 northern hemisphere is further away from the sun