Which of these is a challenge to social relationships as a result of nicotine and tobacco use?

yellow teeth and nails
extra taxes on cigarettes
fear of expulsion from school
penalties from buying cigarettes if underage

Group of genes that encode molecules found in all body cells, creating a biochemical “fingerprint” that serves as the “id” for cells so that they are marked as “self” a) deoxyribonucleic acid (dna) b) entry inhibitors c) major histocompatibility complex (mhc) d) non-nucleoside reverse transcription inhibitors (nnrtis)