Question

4 satellites can do many different things. what is one way they have improved communication systems? a satellites are used to block all tv signals that travel in straight lines so they do not interfere with other communication systems. b some satellites are built underwater to make it easier and cheaper for people to communicate when near bodies of water, like the ocean. c tv signals and long distance phone calls work better now that they travel to satellites facing away from earth, rather than directly towards it. d tv signals do not get blocked by mountains or tall buildings because they now travel upward, where satellites quickly send them back down to earth.

Explanation:

Satellites are in space. TV signals can be sent up to them and then relayed back down. This means that signals don't get blocked by obstacles like mountains or tall buildings on Earth. Option A is incorrect as satellites don't block TV signals. Option B is wrong because satellites are in space, not underwater. Option C is incorrect as TV signals and long - distance phone calls are sent to satellites facing Earth (for proper relaying).

Answer:

D. TV signals do not get blocked by mountains or tall buildings because they now travel upward, where satellites quickly send them back down to Earth.