Courington Detailing's cost formula for its materials and supplies is $2,050 per month plus $11 per vehicle. For the month of August, the company planned for activity of 85 vehicles, but the actual level of activity was 45 vehicles. The actual materials and supplies for the month was $2,880.The spending variance for materials and supplies in November would be closest to.

$335

Explanation:

Actual Level of activity = 45

Cost of Material and supplies = 2050 + 45*11=$2545

Actual Material and supplies = $2880

Spending variance for material and supplies = $335

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.'