Final answer:
A lack of exercise would lead to thin, brittle bones due to decreased stimulation for bone tissue deposition, increasing the risk for conditions like osteoporosis.
Step-by-step explanation:
A lack of exercise would result in thin, brittle bones. This can be expected due to the adaptability of bones, which modify their strength and thickness in response to changes in muscle strength and body weight. Consistently engaging in exercise, particularly resistance training, stimulates the deposition of more bone tissue and increases bone density, while the lack thereof results in the opposite effect - thinner and weaker bones prone to fractures.
Contrary to causing bones to store more calcium, become thicker, or increase in length, inactivity can lead to bone loss and contribute to conditions such as osteoporosis, which is characterized by porous and fragile bones. Therefore, regular physical activity is crucial in maintaining healthy bone tissue.