If a leaf appears toothed, it is a Crenate and Serrate.
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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Answer:
Aristotle first wrote about the practice of animal testing in ancient
Greece during the third century BC.
Explanation:
