When babies are born, many of their bones are still
cartilage. As they grow, these
harden into bone.
What do we call the process
of forming and hardening
bone?
A. digestion
B. circulation
C. ossification

C. ossification

Explanation:

All bones develop in the same way in a process called ossification. At about 10 weeks, bone tissue starts to form as cartilage or membrane. Then, calcium and phosphate – minerals stored in your body and replenished by the foods you eat – are added to the tissue

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.