The sol system has entered a region of space where the laws of nature are slightly different. It will experience different physics for 3 years, then things will return to what we know now.
Which of the following decay chains will have the least impact on earth’s biology during those 3 years?
$^{75}\text{As} \rightarrow ^{75}\text{Se} + \text e^- + \overline{v}_e : \lambda = 12d$
$^{74}\text{Ge} \rightarrow ^{74}\text{As} + \text e^- + \overline{v}_e : \lambda = 12d$
Try to include
which organisms or ecosystems will be negatively impacted,
with references to a clinical information source,
and the best possible estimate for when negative effects will become apparent.
(Only one of these changes has occurred alone, all other physics remains unchanged)