Choose the correct options

1. According to the latest information, Saturn has eighty-two
   [satellites|moons]
   .
2. [Satellites|Moons]
   are used by scientists for various tasks, usually connected with data collection.
3. The trace of water was found on the
   [surface|ground]
   of Mars.
4. In deserts, the
   [surface|ground]
   is very poor and does not allow agriculture.
5. The main difference is that
   [stars|planets]
   emit light and don't move, while
   [stars|planets]
   absorb light and are moving.
6. Why is the
   [exploration|discovery]
   of the Solar System's planets so important?
7. To
   [carry out|confirm]
   any disease, doctors have to do some tests.
8. Scientists
   [carry out|confirm]
   experiments on animals to see how safe a vaccine is.
9. Do you know who
   [invented|discovered]
   the first camera?
10. There is no
    [evidence|footprint]
    of life on Mars.
11. Scientists conduct
    [experiments|developing]
    to confirm or disprove their theory.