D, contains fluid that becomes more concentrated as it moves down into the medulla
Answer:
I'm not sure what the answers are but
Polar bears begin to eat goose eggs as a way to survive when seals, their usual prey, are not available.
Mountain goats restrict their range to higher altitudes because of warmer low-altitude temperatures.
Snowshoe hares change their fur from white to brown to match their warm summer habitats.
Early humans learn to make tools like flint arrows and knives to help them hunt more efficiently.
if these are your options then the answer is
C) Snowshoe hares change their fur from white to brown to match their warm summer habitats.
Answer:<u> Option D
</u>
Solar panels contain a very expensive element, i.e. silicon. This element is able to convert the solar energy into electric energy. The cost of the solar panel gets expensive because of this rare element. It is found in limited areas of the world. That’s why option D is correct. Coal is not used in solar panel, so option B is incorrect. Neither is wind energy, so option A is also incorrect. Water is also not used for exploiting solar energy, which makes option C a wrong answer.
