Mass strandings of whales occur on beaches near military exercises where sonar is used, raising concerns about the effects of human-generated underwater sounds on animal behavior. Scientists are collecting behavioral data on several species of whales to find out how sonar affects them. The researchers also measured the speed and direction of whale swimming in response to the sound exposure. Whales increase their speed and swim away from the direction of sound. Design a study to test the hypothesis that this behavior leads to beach strandings. Note that you will not receive permission to conduct the study if your actions are likely to cause strandings to occur.

Video transcript

Hi everyone. Let's look at our next question. It says migratory animals often prepare themselves before migrating. Why do some avian migrants adjust their internal organs before departure. So avian of course means bird and my adjust internal organs. Um What these birds actually do is essentially re absorb Up to 25 have some of their internal organs, things like their liver and and their digestive tract. And they do this through auto faggy that process of essentially recycling bodily tissues. Um They do have to regain this by immediately eating a whole lot when they finish their migration. But that's actually pretty kind of crazy if you think about it. So why would they do this before departure? And the answer is that migration is very energetically expensive. Um The great distances they travel. And since they migrate by flight um This re absorption and reduction in size of their internal organs has the result of minimizing the excess weight that they need to carry all those distances. So by minimizing excess weight when we look over at our answer choices. Well that's not a choice but Choice A. Is to maximize flight efficiency. And that would be the answer. Um minimizing the weight that needs to come with them, maximizes how um or minimizes the amount of energy that needs to be expended for their migration. Therefore maximizing the efficiency of their flight. So that is our answer. We look at our other choices. Choice B is to deter predators. Well that isn't affected by um adjusting those internal organs. Choice C. Is to attract companions during the journey again. Not an effective this internal organ re sizing and Choice D to adjust their body temperature. Again, not an effect of those organs getting smaller so they re absorb some of their internal organs digestive system to minimize the weight that needs to be carried along on this migration. Therefore, Choice A maximizing their flight efficiency. See you in the next video.