A typical physical change in early adulthood is:

• A. increase in muscle strength and reflexes.
• B. increase in fatty tissue, which leads to weight gain.
• C. increase in height because of spinal disc expansion.
• D. increase in respiratory rate due to increased metabolism.

Answer: (B)

In early adulthood, the body’s growth in height has long since ended, and lean muscle gains depend largely on activity and training. A common and natural change is a gradual increase in fatty tissue, which can lead to weight gain if caloric intake isn’t balanced with activity. This reflects shifts in body composition that many people experience as metabolism nudges downward slightly with age and lifestyle choices influence fat accumulation.

The other ideas don’t fit as typical early-adult changes. Increases in muscle strength and reflexes usually come from targeted training rather than a universal, automatic change. Height increasing due to spinal disc expansion occurs earlier in development and is not a feature of early adulthood. Resting respiratory rate does not inherently rise with metabolism in a typical healthy adult.