A female experiencing her period is an example of which sexual characteristic? primary or secondary?

Which of these is likely to be the best source of valid health information?

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)

Which of the following is not a symptom of chronic fatigue syndrome