Is the total amount of money received from the sale of goods or services, as well as from other business activities such as the rental of property and investments.

Annual income is the total amount of income an individual earns in a year from working, interest income, dividends, gifts, and so forth. Income money that is received from any source, including the money one earns through labor, for services, from the sale of goods, allowance, disability, inheritance, and investments.

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.'

answer; how many employees will be needed for jobs in the coming period;