TLS Online TPP Program

#Question id: 11985


In  the  territorial  behavior  of  the  stickleback  fish,  the  red  belly  of  one  male  elicits  attack  from  another  male  by functioning as

#Section 1: Ecology
  1.  A pheromone 
  2. A sign stimulus
  3. A fixed action pattern 
  4. A search image