There are no plants on Mars. We know this because of the rovers we have sent and the satellites we have taking pictures of the planet.
As of November 2016 there are two operational Mars rovers: Opportunity and Curiosity.
There have been seven attempts at sending rovers to Mars of which four landed successfully.
Yes, Mars has had both satellites and robots sent to explore it. Satellites such as the Mars Reconnaissance Orbiter have provided valuable data and images of the planet from orbit, while robotic rovers like Curiosity and Perseverance have been deployed on the surface to conduct experiments and gather samples.
there are currrently 2 known satellites oribiting mars
THEY WERE SENT TO MARS SO THAT WE CAN DISCOVER MANY NEW THINGS ON MARS!!!
4 rovers :- Sojourner Opportunity Spirit Curiosity.
There are many satellites and robots that have explored Earth. Some notable examples include the Hubble Space Telescope, Landsat series of satellites, Sentinel satellites, and the Mars rovers Spirit, Opportunity, and Curiosity which have provided valuable data and insights about Earth and beyond.
There are two Mars rovers, named Spirit and Opportunity. There's obviously "Curiosity" now too. In fact Spirit doesn't work anymore, so there are still two Mars rovers working.
No one has sent 15 rovers to Mars
Mars rovers were made sometime in the 1970's
So far, Nasa has successfully acquired four Mars rovers: the Mars Pathfinder, Sojourner, Opportunity, and the Spirit. These were managed by the Jet Propulsion Laboratory and the Mars Science Laboratory.