Final answer:
Singing is true to improve oxygen intake and speech development as it strengthens respiratory muscles and requires clear pronunciation, contributing to speech muscle development.
Step-by-step explanation:
The statement that singing improves oxygen intake and speech development is true. Singing involves the use of the diaphragm and abdominal muscles which helps increase the capacity of the lungs, thereby potentially improving oxygen intake. Practicing singing regularly can lead to better breath control and is likely to have a positive effect on how oxygen is taken into the body. Additionally, singing also requires clear pronunciation and use of various speech muscles, which may contribute to the development of those muscles and thus improve speech.
The Talk Test is a method used to estimate exercise intensity. It suggests that if a person can talk but not sing during moderate-intensity aerobic activity, this indicates an appropriate level of exertion. These concepts can indirectly support the idea that singing can improve both respiratory and speech functions by engaging related muscle groups and requiring control over breathing.