An income sufficient to live on or the means of earning it.

Inanimate; inorganic.

consisting of a single cell

having or consisting of many cells

Microscopic organisms typically consist of a single cell, which is either eukaryotic or prokaryotic.

a theory in biology that includes one or both of the statements that the cell is the fundamental structural and functional unit of living matter and that the organism is composed of autonomous cells with its properties being the sum of those of its c

a microscopic single-celled organism that has neither a distinct nucleus with a membrane nor other specialized organelles.

an organism consisting of a cell or cells in which the genetic material is DNA in the form of chromosomes contained within a distinct nucleus

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.

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.

In biology, an organ system is a group of organs that work together 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.

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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