Which of the following statements correctly describes the effect a nonsense mutation would have on a gene? a) it changes an amino acid in the encoded protein. b) it alters the reading frame of the mrna. c) it introduces a premature stop codon into the mrna. d) it has no effect on the amino acid sequence of the encoded protein.

the correct answer was location c, because earth is tilted away from the sun at this time

the right option is; decreased genetic variation  

decreased genetic variation describes the effect of this environmental change.

genetic variation is the naturally occurring genetic diversities or differences between organisms of the same species in a population. genetic variation allows the survival and adaptability of a species when they encounter changing environmental conditions. when an endangered species reduces, it loses genetic variation which may not be restored even if the species rebound and will only be recovered through the gradual collection of mutations over many years.

what is the question? is it 'what is one of the reasons that someone could be b12 deficent?