Hairs are mostly fibrous proteins and are composed of keratin, and also the main constituent of skin, nails, wool, woof, feathers etc.
Keratin is the essential fibrous protein which has a structural and protective functions in the epithelium.
Answer: Aristotle's and Linnaeus's classification systems both divided all life into two groups: plant and animal.
Answer:
Light, minerals, and things from the periodic table!!
Explanation:
Lymphoid organs in the immune system, includes the bone marrow
the cell goes into osmosis and goes into hypnotic solution
