Answer: c. Internal statistics
Sexually transmitted diseases and diseases like ebola and zika virus
A difference between the three are that arteries are larger than capillaries and veins. However, veins are larger than capillaries.
A tic is a random or sudden, involuntary, repetitive motor movement or vocalization involving distinct muscle groups. Motor tics can include eye blinking, nose crunching, pulling at clothes or touching others. Vocal tics can include clearing one's throat, expressing simple sounds or uttering curse words or racist terms
