Solution:
Placenta is the structure formed by the union of foetal and uterine tissue.

Solution:
A subdiscipline of anatomy, anthropology, and paleontology, osteology is a detailed study of the structure of bones, skeletal elements, teeth, microbone morphology, function, disease, pathology, the process of ossification (from cartilaginous molds), and the resistance and hardness of bones (biophysics).

Solution:
Liver is the largest gland in body. It stores its waste bile in Gall Bladder. Bile is released into duodenum and helps in digestion of fats.

Solution:
Cretinism is due to the disorder of the thyroid gland.

Solution:
Vena Cava is responsible for carrying impure blood to the human heart.

Solution:
A pacemaker is a small device that's placed in the chest or abdomen to help control abnormal heart rhythms. This device uses electrical pulses to prompt the heart to beat at a normal rate.

Solution:
Star Fish shows radial symmetry.