What is the term that developmentalists use to describe repetitive consonant–vowel combinations such as "ba-ba-ba" or "do-do-do?"

Evolutionary psychologists study:

a. which human traits are evolved adaptations- the products of natural selection or sexual selection. b. how apes evolved into humans. c. how humans made use of the environment. d. if climate change might have killed humans off.

What is the difference between positive and negative schizophrenic symptoms?

A. Beneficial behaviors versus harmful behaviors B. Behaviors that are present versus behaviors that are absent C. Behaviors that are related to abnormal brain functioning versus those that are not D. Behaviors shown by one personality versus behaviors shown by another