Explanation

Kerosene, is a combustible hydrocarbon liquid which is derived from petroleum.

It is widely used as a fuel in aviation and households.

Explanation

In the membranous skeleton, the perineurium sheath surrounds the central nervous system. 

The perineurium is a protective layer of connective tissue that encases nerve fibers.

It providing support and shielding them from external damage.

Explanation

Answer:

C

  excess perspirations causes weakness,  because of the loss of more water from the body

Explanation

The respiratory system consists of air-filled tubes or tracheae, which open at the surface of the thorax and abdomen through paired spiracles. 

Explanation

The structure of the earth is divided into four major components: the crust, the mantle, the outer core, and the inner core. 

Explanation

The inner planets, or terrestrial planets, are the four planets closest to the Sun:ev

Explanation

The noun discovery means the finding or uncovering of something.

Explanation

The human heart is an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes. 

Explanation

Cholesterol is a waxy substance called a lipoprotein

Explanation