Answer: the tree main features of a synovial joint are articular capsule, articular cartilage and synovial fluid.
Explanation:
The embryonic stem in a seed is the plumule.
it grows out of the hypocotyl, which that itself grows out of the radical, which is attached to the microphyl, feeds on the cotyledon, is fertilized by the endosperm, and is all protected by a hard seed coat :)