In males, the third pair of legs are modified to form copulatory organs.

In male ricinuleids, the third pair of legs are uniquely modified to form copulatory organs.

The various kinds of tissues group together to form organs.

They form underground organs as spindle-shaped rhizomes that are used for reservation of nutritions.

They are described as "protoplasmic", lacking any default body shape and instead being able to form limbs and organs at will.

Hematology ( also known as Haematology ) - the study of blood and blood - forming organs.

Mesothelioma: A rare form of cancer that forms from the cells lining various organs of the body with the lungs being the most common.

These germ layers then differentiate to form tissues and organs.

In certain insects they are not used as jaws, but may form suctorial organs.

The blood smear was gathering into larger clots, growing darker as the centers formed new organs.