Answer:
tropical evergreen forests
Explanation:
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CO is poisionous and CO2 is non toxic in nature.
CO forms complex with haemoglobin which is more stable than complex of oxygen with haemoglobin. The concentration range of 3-4 % of CO decreases the oxygen carrying capacity of blood. This causes headache, weak eyesight, nervousness and cardiovascular disorders. Higher concentration can be fatal. CO2 is harmful at a very high concentration.
Formed by outgas (release or give off as gas or vapor) in space
B. Because nickel silicon and magnesium is not correlated to lava(magma) so there for b is your answer