(a)[2]
Explain how sweet clover may improve the soil where it grows.
(b)[1]
As sweet clover dries, fungi growing on it produce a chemical (dicoumarol) that prevents blood from clotting. Suggest a protein that cattle eating sweet clover affected by such fungi may be unable to produce.
(c(i))[2]
Describe the change in the $LD_{50}$ for dicoumarol in rats between 2000 and 2015.
(c(ii))[4]
Suggest an explanation for the change you described.