Which of the following statements is correct? a. the preemptive right gives stockholders the right to approve or disapprove of a merger between their company and some other company. b. the preemptive right is a provision in the corporate charter that gives common stockholders the right to purchase (on a pro rata basis) new issues of the firm's common stock. c. the stock valuation model, p0 = d1/(rs − g), cannot be used for firms that have negative growth rates. d. the stock valuation model, p0 = d1/(rs − g), can be used only for firms whose growth rates exceed their required returns. e. if a company has two classes of common stock, class a and class b, the stocks may pay different dividends, but under all state charters the two classes must have the same voting rights.

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.'

the correct answer is economics is a game without winners or losers.

unlike sports or games economic is a game without losers or winner rather it is a game where everyone wins. parties of business doing businesses exchange money with each other and hence exchange is done on the basis of goods. one party takes the goods and other sales it so there is winner on both sides. each party values more highly the good it gets than the good it gives up. both sides exchange only because both intend to increase their value. so there is no concept of lose or win.