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1.What was hard was coming up with a working elbow joint and figuring out what material's to use.
2.The fun thing was working with the material's and working with partners because you can see different perspective's on the project.
3.Bicep's and triceps work together by contracting and relaxing. When you are goes up your tricep pull's or contracts and the bicep relaxes. The thing that keeps the Radius, ulna, and the humerus from breaking or rubbing against each other is the cartilage, the cartilage is like a pillow for your radius, ulna and the humerus, the cartilage prevents the bones from breaking into tiny pieces. The thing that holds the bones together is called a tendon a tendon is like a rubber band that hold's your humerus, radius, and the ulna.