Submitted by admin on Mon, 04/28/2014 - 18:45
definition:
A chemical substance produced and released into the environment by an animal, especially a mammal or an insect, affecting the behaviour or physiology of others of its species.
sentence:
Once an enterprising hornet scouts out a bee colony, it marks the nest with a type of bodily chemical substance called a pheromone.
difficulty:
hard
toefl frequency:
1