Some migratory birds are heterothermic, meaning they sometimes maintain a constant body temperature and other times allow their body temperature to vary, for example, on cold nights, they sometimes reduce their metabolic rate and allow their body temperature to drop as the air temperature falls. which of the following hypotheses about this unusual strategy is consistent with what you learned in this section? birds allow their temperature to drop in order to increase their assimilation efficiency o birds allow their temperature drop in order to increase their production efficiency birds allow their temperature to drop in order to increase their consumption efficiency.

If bacteria are much too small to see, what is one reason why can we see colonies in the petri dishes that have plenty of food to eat after only a few days?

Sally and sue were investigating the topic of friction in science. they used a small car and a ramp as seen in the picture to test what they were learning. they knew that they slipped easily on waxed floors but not on carpet, so they decided to change the material on the surface of the ramp to see what happened. they planned to use glass, carpet, aluminum foil, and sandpaper and run the car down the ramp over each surface. what would be the best research question to guide the girls' experiment? a) does the amount of surface area affect the friction on the moving car? b) will the car travel fastest on the glass surface? c) how does the angle of the ramp affect the speed of the car? d)do rougher surfaces tend to create more friction than smooth surfaces?

How does human environment effect the biosphere