In a typical e-mail address, the "host" is

a. an account designated by a user name.
b. the computer that houses an internet connection.
c. the receiver of an e-mail message.
d. cpu processor 2500

In a typical e-mail address, the "host" is the computer that houses an Internet connection. The correct option among all the options that are given in the question is the second option or option "B". I hope the answer has actually come to your great help.

answer: when the substance contain the two parts (polar and non-polar) like soap.

explanation:

soap is produced from the basic hydrolysis of ester "saponification", it is considered as a salt of hydrocarbons. the soap molecule contains the two parts: a polar group   (-coo-na+) and a non-polar group (r-hydrocarbon part). the polar group is called the head and the tail is the non-polar group. the polar group is hydrophilic in nature (water loving) and the non-polar group is hydrophobic in nature (water repelling).the polar/non-polar nature of a substance is useful that it can dissolve the non-polar substances by the polar part and also can dissolve the polar substances by the non-polar part. it commonly used in detergents and soaps.