Sound waves with a single frequency are known as a. pure ...

[Jramos095]

Sound waves with a single frequency are known as
 
  a. pure tones, which are rare in nature.
 b. pure tones, which are common in nature.
 c. complex tones, which are rare in nature.
 d. noise, which is common in nature.

Question 2

Neurons in the lateral hypothalamus involved with the initiation of complex feeding behaviors may secrete
 
  a. TSH and ACTH.
 b. MCH and orexins (hypocretins).
  c. MCH and ACTH.
 d. TSH and orexins (hypocretins).

[ergserg]

Answer to Question 1

a

Answer to Question 2

b