organelle found in large numbers in most cells.

microscopic organism. Extremely small living thing that cannot be seen.

infective agent that is able to multiply only within the living cells of a host. Files secretly put on computers to cause harm.

A colorless chemical element without a smell.

obsessive interest.

member of large group of unicellular microorganisms.

arrangement of and relations between parts or elements of something complex. The ways some things are built, arranged or organized. To make or build with an organized framework.

living organism. Living creatures that are not plants or people.

characterized by absence of distinguishing features. no. Reply to a question or statement that means 'no'. refuse to accept.

organism consisting of cell or cells in which genetic material is DNA in form of chromosomes contained within distinct nucleus. Organisms with cells characteristic of all life forms except primitive microorganisms such as bacteria.

branch of science that deals with microorganisms.

class or division of people or things regarded as having particular shared characteristics.

To open an essay to set the scene.

as stated by. To give (someone) the respect due to them.

Being what was wanted or needed. used to greet someone in polite or friendly way. Friendly greeting to someone who has arrived. To accept or receive something happily and gladly.