a form of being alive

a form of not living

One cell

Two or more cells

the smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane. Microscopic organisms typically consist of a single cell, which is either eukaryotic or prokaryotic.

Historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells.

A unicellular organism that lacks a membrane-bound nucleus, mitochondria, or any other membrane-bound organelle.

An organism whose cells contain a nucleus surrounded by a membrane and whose DNA is bound together by proteins (histones) into chromosomes.

The action or process of differentiating.

the smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane. Microscopic organisms typically consist of a single cell, which is either eukaryotic or prokaryotic.

Any of the distinct types of material of which animals or plants are made, consisting of specialized cells and their products.

a part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in humans.

n organ system is a group of organs that work together as a biological system to perform one or more functions.

an individual animal, plant, or single-celled life form.

an undifferentiated cell of a multicellular organism which is capable of giving rise to indefinitely more cells of the same type, and from which certain other kinds of cell arise by differentiation.

an infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen by light microscopy, and is able to multiply only within the living cells of a host.

a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some which can cause disease.

a simple sugar which is an important energy source in living organisms and is a component of many carbohydrates.

the internal organ in which the major part of the digestion of food occurs, being (in humans and many mammals) a pear-shaped enlargement of the alimentary canal linking the esophagus to the small intestine.

the central and most important part of an object, movement, or group, forming the basis for its activity and growth.

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