In sea stars, the ( ) surface is the top of the animal and contains the madreporite. A: aboral B: oral C: madreporite D: anal E: rigid

The landmark of distinct internal and external hemorrhoids is A: dentate line B: white line C: anal pecten D: anorectal line

Which of below can not be touched by finger through anal? A: seminal vesicle B: prostate C: ampulla of vas deferens D: ureter

Freud believes that harsh potty training during ( ) will lead to obsession with cleanliness and paranoia in adulthood. A: the oral stage B: the anal stage C: the phallic stage D: the latent stage

STIs can be spread through___ A: penis + vagina = sex B: oral sex C: anal sex D: ubbing, touching genitals E: infected objects F: kissing, deep kissing

According to the passage, the invention of the visible - light microscope allowed scientists to ______. A: see viruses directly B: develop the electron microscope later on C: understand more about the distribution of the chemical elements D: discover single-celled plants anal animals they had never seen before