Marginal cost is defined as the change in cost when output changes by one unit. In the short run

Marginal cost is defined as the change in total cost when output changes by one unit in the short run.

Explanation:

Marginal cost is defined as the change in total cost when output changes by one unit. In the short run.

It is the amount by total cost will increase as a result of producing additional one more unit of a product.

Marginal cost is defined as the percentage change in total when output changes by one unit

Explanation:

Marginal cost is the cost of producing one extra unit of output.In order to marginal cost, the below formula is helpful:

marginal=total cost at succeeding output level-total cost at preceding output level/(volume at succeeding output level-volume at preceding output level)

Assuming the total cost and volume at succeeding levels are $4000 and 4000 units

Then total cost and volume at preceding ones are $3000 and 3000

Marginal cost=$4000-$3000/4000-3000

                    =$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.'

say it in english maybe we can