During physical growth, what aspect is NOT influenced by maturity?

Bone density does not directly correlate with maturity in the same way that muscle mass, cardiovascular efficiency, and body size do. While maturity can affect how the body develops and whether an individual reaches their peak bone density, the biological factors influencing bone density include genetics, nutrition, and overall physical activity rather than just the advancement of maturity. Muscle mass typically increases with maturity due to hormonal changes and physical training, while cardiovascular efficiency often improves with age and increased physical activity. Similarly, body size tends to grow and change in relation to maturity, especially during pubertal growth spurts. Thus, bone density stands out as less directly tied to the concept of maturity compared to the other options listed.