Which of the following would increase the rate of heat exchange between an animal and its environment? a. feathers or fur b. vasoconstriction c. wind blowing across the body surface d.countercurrent heat exchanger

Video transcript

Hello, everyone here's our next question, which of the following prevents heat loss among animals during cold winter. And our choices here are brown for white and thick for long eyelashes or big ears. Let's look at A. And B. Together because obviously brown for versus white for our sort of opposing choices here for our correct answer. So we can assume thick fur will prevent heat loss and then interestingly white for actually thought to prevent heat loss because it lacks pigment, creating a space in the hair shaft. And it's thought that air can take up that space and act as insulation. So brown fur doesn't have any particular property to prevent heat loss. We can eliminate that, but thick white fur would help insulate the animal against heat loss. So be should be. Our answer will just look down at C. And D. To make sure choice C. Long eyelashes. Well, that would be an adaptation in dusty hot environments protecting the eyes from dust and evaporation. So we can eliminate choice see and D. Big ears while big ears are another adaptation for warm environments. Since the blood can circulate near the surface of those large ears and allow a lot of heat loss to cool an animal down. So we eliminate choice D. As well. So our correct answer is choice be white and thick for see you in the next video