Answer to Question 1
(a) They all have eight legs.
(b) They have the same life cycle.
(c) They all possess biting mouthparts.
Answer to Question 2
(a) The behavior of some animals in a public place (including potential of a bite)
(b) Contamination (dirt, parasites, hair)
(c) Other diners' aversion to animals
(d) Zoonotic potential