Answer:
Explanation:
A ruler
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Answer:
The physical components that a computer is made of
Explanation:
as u can see these components and u can repaire these components if they got damaged
My opinion is the answers A and D. I would choose A if you can only choose one, though.
Answer:
A wave of sound!
Explanation:
sound waves are sound but sound comes in different wavelengths
B. Add actions , such as fly ins , between slide
