Final answer:
The statement 'Speech Sounds (Phonology) - Spoken, Conversational Language' is true.
Step-by-step explanation:
a. True
Human speech is produced by shaping the cavity formed by the throat and mouth, the vibration of vocal cords, and using the tongue to adjust the fundamental frequency and combination of speech sounds.
These speech sounds are a part of phonology, which is the study of how sounds function within a particular language.
For example, in the English language, the /s/ sound can be spelled in different ways, such as 's' in 'sit' and 'c' in 'city.' These variations in spelling reflect the different speech sounds that make up spoken, conversational language.