Various species emit chemical substances called that play ...

[jjjetplane]

Various species emit chemical substances called that play important roles in many behaviors.
 
  a. olfactory hormones
  b. pheromones
  c. neurotransmitters d. natural fragrances e. olfactions

Question 2

Elvin is 75 years old. He is rather sad because he regrets the wasted opportunities in life and feels he has made a lot of mistakes. From Erikson's perspective, this reflects a sense of
 
  a. despair.
  b. ego integrity. c. isolation.
  d. stagnation.
  e. generativity.

[diana chang]

Answer to Question 1

b

Answer to Question 2

a