What is a solvent or other material producing vapor that is inhaled by drugs abusers?

What is one limitation of the myplate guidelines

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)

If you are having a hard time lifting something, you should arch your back. a. true b. false