Answer:
I believe that it's (a) cerebellum
Explanation:
"The cerebellum controls voluntary movements such as posture, balance, coordination, and speech."
The answer to the question above is true that the word 'competent' is used correctly in the "it is important to use competent sources when researching" sentence<span>. The word "competent" means a characteristic of acceptable and satisfactory. The sentence above means that it is important to use acceptable sources for a research.</span>
It says in your reading, so for someone to answer that we need to know the reading material.
