Structures which are derived from the midgut are:
gametangia
gametangia
Chromosomes
chromatin threads
caves, and cliffs
Volcanoes.
Hairs are structures are formed by portions of the epidermis that extend into the dermis and are adjacent to dermal papillae.
They are called molecules.
pseudopod
nothing
The male structures formed from the mesonephric duct are:* ductus epididymis * ductus deferens * ureter * pelvis, calyces, collecting tubules (in the kidneys) * ejaculatory duct * seminal vesicle
Natural structures are formed by themselves whereas man made structures are built to look like something ...