For the first one, the answer is A. And for the second one, the answer is D.
Answer:
What is the question about?
Explanation:
Answer:
Light waves travel in straight paths called rays. Unlike sound, where waves have to travel through matter to be heard, light waves do not have to travel through matter to be seen. Instead, rays travel in a straight path until they hit an object.
Explanation:
Because the higher up you are the less oxygen available and you could suffocate.