Answer: Microscope
Explanation: This is a kid answering :)
Answer: C
Explanation: The ocean floor is largely unexplored so no one knows what it is like.
Answer:C
Explanation: The mass is still the same even though they took it apart.
Answer:
4)experiments with cathode ray tubes
Explanation:
when sufficiently high voltage is applied across the electrods, current starts flowing through a stream of particles moving in the tube the negative electrode (cathode) to the positive electrode (anode). These were called Cathode Rays or Cathode Ray Particles
