Barbara has $70. 00 in her pocket and a $20 gift card. Which purchase will she be able to make without having to use her credit card? a portable radio for $65. 95 and speakers for $29. 99 five books for $18. 95 each headphones for $25. 99 and eight CDs for 8. 99 each six puzzles for $11. 99 each and a board game for $15. 89.

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; the nav calculated at the market close at 4: 00 pm new york time;

answer; foreign exchange transaction;