Answer:
A. first class lever
Explanation:
the fulcrum is in the middle of the effort and the load.
Your brain and heart hope this helps
Answer:
D.Anterior movement of a part of the body in the transverse plane
Protraction is the anterior movement of a bone in the horizontal plane. Retractionoccurs as a joint moves back into position after protraction. Protraction and retraction can be seen in the movement of the mandible as the jaw is thrust outwards and then back inwards.
Answer: Vertebrae
Explanation: Your back is composed of twenty-four individual bones called vertebrae that are stacked one on top of the other to make up your backbone or spinal column. The entire column sits on the sacrum, a large triangular bone that connects the spine to the hips. The top seven vertebrae in the neck are called the cervical spine.