Questions

The size of gear is usually specified by pitch circle diameter.

Eugenics is the study of altering human beings by changing their genetic components.

It is the study of the agencies under social control that may improve or impair the racial qualities of future generations either physically or mentally.

Havana is the capital city of Cuba.

It's currency is Cuban Peso.

Molecular compounds are those with covalent bonds between the elements and those elements are typically non metals.

Here in the given options, Ar is an element. NaI has an ionic bond. Hence, N2O4 has a covalent bond between the two non metals and is a molecular compound.

Genes: The DNA is the genetic material. The DNA is made of several nucleotides. A nucleotide means, one nitrogenous base one sugar molecule and a phosphate molecule. These Nucleotides occur in sequences and several nucleotides form one gene ( a functional gene is called a cistron)

Photography is a word derived from Greek words Photo means light and graphe means drawing.'Hence it literally means light drawing.

typedef struct node * treeptr

typedef struct node

{

         int data1;

         float data2;

         treeptr *left;

         treeptr *right;

}treenode;

treeptr ptr;

ptr = ( treeptr ) malloc ( sizeof ( treenode ) );

A food chain is the only chain we can eat.