Questions

Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.

Because arteries have to have thick walls for use of protection. Its when you get to veins where the walls get thinner. And the use of the heart is to pump blood to all of the cells and organs in the body so it would be to transport blood away from the heart.

i.e. 

Arteries = Away from the Heart 
Veins = Back to the Heart.

The processor made of PMOS / NMOS / HMOS / HCMOS technology is called 1st / 2nd / 3rd / 4th generation processor, and it is made up of 4 / 8 / 16 / 32 bits.

Robert Brown, Scottish botanist, Discovered The Nucleus of a Cell in 1831, London. When Brown was studying orchids under microscope when he observed an opaque area, which he called the "Areola" or "Nucleus", in the cells of the flower's outer layer.

The nucleus was also described by Franz Bauer in 1804 but in detail Robert Brown made it in 1831.

Lord Dalhousie was appointed as Governer General of India from 1848–1856. The first railway line connecting Bombay and Thane was laid under his authority in 1853 and is known as the maker of Modern India. He made way For Telegraph Services in India. 

He is also called as Father of Indian Railways.

Chethan bhagath is the author of One Night @ Call Center

Macronutrients are located on the Top of a Nutritional Label.

Macronutrients are essential substances that the body needs to survive and develop. There are 3 main Macronutrients:

1. Fats

2. Proteins (and)

3. Carbohydrates.

The nutritional label is an important part of any food package. Since the Macronutrients refer to a list of nutrients that we need daily in a pretty large amount are the most important nutrients to sustain our living, commonly they are written on the top of the Nutrition Labels.