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.
Explanation:
no dear I'm not sad but why are you sad
4 and F, 9and E r 2 of the answers
What I Think It Is, Global Warming :)
Vertebrae are the scientific term for the backbones.
All backbones are backbones... right? :'D
However, the vertebrae are only a bone GROUP; there are other types of bones like joints, shafts and etc which don't come under the vertebrae clssification.