This is due to earths location in the solar system. Earth is in the habitat zone or the Goldie locks zone, in this zone it's not too hot or not too cold for water to exist. Other planets in different star systems have liquid oceans due to them being in the habitat zone.
Most ultrasound technicians train in an associates degree, but can also get a bachelors degree in the field. There is also certification programs you can go through. Hope this helped!!! :)
Answer:
it's Newton's first law of motion
As the law states that.
Everybody continues in its rest or of uniform motion unless an external force acts on it.
Choice ' C ' is a correct statement.
The other choices aren't.