Use the dichotomous key to identify these plant leaves. Leaves from which plant are shown? pine catalpa dogwood maple

C. two bones ... you may get confused and ligaments < they only hold them together.. a joint is a connective bone which means it can attach two or more parts with it. This is in your skeletal system process (you will learn more about if you take Biomedical Science or Human body systems!) 

Hope This Helped :)