Answer:
Ionic
Explanation:
Any metal with a nonmetal is an ionic bond due to the transfer of electrons from one element to another.
C. Spacecraft are built to be airtight.
The answer for your question is Chemical energy is spontaneously converted to electrical energy.
Your skeletal system consists of all the 206 bones and the 360 joints in the human body. This includes the cells, protein fibers and minerals that make up your bones.