Explanation

Explanation

The effects of the thyroid come from two iodine containing-hormones

Explanation

The fan was invented in 1882 by Schuyler Skaats Wheeler. 

Explanation

The four main types of steel:

1. Carbon Steel,
2. Alloy Steel,
3. Tool Steel
4. Stainless Steel.
   

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

Earth has the highest density of any planet in the Solar System, at 5.514 g/cm3.

This is considered the standard by which other planet's densities are measured.

Explanation

Adrenal glands, also known as suprarenal glands, are small, triangular-shaped glands located on top of both kidneys

Explanation

CNG as compared to other fuels, causes less pollution.

The reason is that it is made up of methane.

There is less carbon emission.

Explanation

Explanation

Venus travels around the sun once every 225 Earth days but it rotates clockwise once every 243 days.

Venus is the brightest planet.