Im pretty sure that its nondisjunction
Okay. The destruction of tundra vegetation will not really freeze the soil or deepen the active zone much. Therefore, A and C are eliminated. The destruction of the vegetation can actually melt permafrost, which contributes to global warming. The answer is D.
The first question is the first option (4 haploid cells; 2 diploid cells).
The second question is the first option also (nitrogen).
If wrong I’m sorry but good luck! Have an amazing day!