The mean preferred time of going to sleep gets later and later ...

[rachel9]

The mean preferred time of going to sleep gets later and later until about age 20 and then starts a gradual reversal.
 
  a. True
   b. False
  Indicate whether the statement is true or false

Question 2

A(n) ____ explanation of the brain invokes the chemical reactions that enable hormones to influence brain activity.
 
  a. ontogenetic
 b. evolutionary
 c. physiological
 d. functional

[jaymee143]

Answer to Question 1

True

Answer to Question 2

c

[rachel9]

Thanks for the timely response, appreciate it

[diana chang]

Excellent