There is external and internal so I'll list th external. The most important is skin then mucus, sweat or secretion, hair, nails and tears which are all part of the integumentary. Some internal defenses are white blood cells and T cells.
It was developed by scientists throughout history of mankind
Answer:
the answer is :
Lane 3 contains the longest DNA fragment
A magnifying glass is an example of a simple microscope. The correct answer is will be D, simple microscope.
