Answer:
C) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere.
Explanation:
Electromagnetic waves do not require a medium to travel. they can travel through vacuum also. for example:- light wave is an electromagnetic wave and it can travel through vacuum also.
On the other hand, sound wave require a medium to travel. sound waves can not travel through vacuum.
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The energy of the ecosystem can be best described as option C. The amount of energy entering an ecosystem from the Sun is equal to the amount used by organisms plus the amount lost as heat.
It should be a food web, because there are various producers and consumers, and the bears and humans eat each other
It is c I believe cause the human cells can’t make their own food like plants do when they photosynthesis
Hey there..
If I'm correct the guidelines are: reuse, reduce and recycle.
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