it is called matter.
the most striking visual difference between taiga and tundra is the presence of trees. the taiga has a thick forest of conifers such as pine and spruce, while in the tundra trees are absent completely
the correct answer is - no.
even though mars in many ways can be seen as a planet similar to the earth, it is still a planet that is very different and doesn't have the right conditions for human existence on it.
for the time being, mars is a planet where there's frozen water, constant dust devils, raging storms, infertile soil cover with big layer of dust, thin atmosphere, large radiation, which are all indicators that at the present, human life is not possible there.
on the other hand, with the development of the technology on our planet, maybe in the future the scientists will find a way as to how to make the ''red planet'' habitable, as there are few predispositions that may allow for future life to develop on it.