Discrete facial expressions that occur early in infancy are ...

[soccerdreamer_17]

Discrete facial expressions that occur early in infancy are called basic emotions because they
 
  a. are the emotions that are most easily identified by experimenters who study emotion.
  b. constitute a set of emotions that appear to be biologically determined.
  c. are the simplest and first emotions the infant learns.
  d. are the emotions first identified by caregivers.

Question 2

Why and how must researchers pay close attention to variables when measuring developmental attributes and behaviors?
 
  What will be an ideal response?

[ebe]

Answer to Question 1

B

Answer to Question 2

In order for the data collected to be meaningful and useful, the variables must be operationally defined. That is, they must be reliableconsistent across observers or measurementsand validan actual measurement of the concept under consideration.

[soccerdreamer_17]

Wow, this really help

[nothere]

Thanks for the timely response, appreciate it