D. As salt water in the oceans.
Answer:
The heart valves
Explanation:
The heart valves prevent blood from flowing in the wrong direction in the heart. The valves are held in the proper place because of the chordae tendinae.
Covalent bond because a covalent bond is when it only shares electrons and it doesn't give or lose.
Answer:
C. Mt. Maton
Explanation:
not sure but hope it helps
