The investigators could distinguish human hair from animal hair by the patter of pigmentation and by the medullary index.
The pigmentation in human hairs is denser toward the cuticle, whereas in animal hair is denser toward the medulla. Human hairs are usually one colour throughout the whole length, while animal hairs may change colour suddenly.
The medulla in humans is thinner than in animals: the medullary index for human hairs is 0.33 or less; the medullary index for animal hairs is 0.5 or more.
Four egg cells are produced in meiosis but only one will actually be used.
Answer:
Visceral pleura
Explanation:
The pleura forms the main component of the respiratory system whose main objective is to carry out the process of respiration without any difficulty and also to reduce friction during the time of breathing.
It is basically comprised of two types namely-
(1) The Parietal pleura
(2) The Visceral pleura
The visceral pleura can be usually referred to as one of the important and fine membranes that surround the surface of the lungs. It is separated by the parietal pleura due to the presence of a pleural fluid between them.
On the other hand, the parietal pleura is responsible for surrounding the internal portion of the chest cavity and is comparatively thicker than the visceral pleura.
