Sodium chloride, or na*ci, is an example of a molecule whose atoms are
held together by which of the following?
oa) hydrogen bonds
ob) covalent bonds
oc) metallic bonds
od) ionic bonds

answer; /// i believe the correct answer is (thrombocytopenia); (a)

the correct answer is c   with the systems

it creates acid rain

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.