When the price of a gizmo is $50, 100 gizmos are sold. when the price of gizmos is $60, 120 gizmos are sold. using the midpoint formula, the price elasticity of demand is equal to?

1

Explanation:

The Price Elasticity of Demand (PED) oF gizmos using the mid-point formula is calculated in this way:

PED = (Q2-Q1) / [(Q2+Q1)/2] / (P2-P1) / [(P2+P1)/2]

       = 120 - 100 / [(120+100)/2] / $60-$50 / [($60+$50)/2]

       = 0.18 / 0.18

       = 1

ans.

heterothermic organisms include those organisms that can switch between homeothermic (having body temperature higher than environment) and poikilothermic (having variation in internal body temperature) strategies.

some migratory birds show heterothermy as they decrease their metabolic rate during cold nights to keep their body temperature low. drop in metabolic rate allows increase in production efficiency of birds that reduces the internal body temperature to make it equal to external cold temperature during cold nights.

thus, the correct answer is 'birds allow their temperature drop in order to increase their production efficiency.'