Water is a really good conductor of sound so I would have to say that it would be to send the message underwater because a more dense medium produces a louder sound
Answer:
i do not know
Explanation:
im doing for education too
' D ' is the only correct statement on the list.
Electromagnetic waves are capable of traveling through
many substances, and they're also capable of traveling
through vacuum. Mechanical waves can't travel in vacuum.
This is in the thermosphere which is at an altitude of 85-520km
Carbon dioxide and water :) hope this helped!