(singular: alga) diverse group of aquatic organisms, the largest of which are seaweeds.
substance (such as pollen) that induces a negative bodily reaction, such as sneezing, wheezing, itching, or difficulty breathing.
having a consistent, unusual, negative reaction to a substance.
sensitivity to a specific substance (such as pollen) which causes a negative bodily reaction, such as sneezing, wheezing, itching or difficulty breathing.
structure, form, or appearance of features relating to the body structure of organisms.
(singular: bacterium) single-celled organisms found in every ecosystem on Earth.
smallest working part of a living organism.
series of organs and glands responsible for the ingestion, digestion, and absorption of food. Also called the alimentary canal.
harmful condition of a body part or organ.
community and interactions of living and nonliving things in an area.
powerful device that uses electrons, not light, to magnify an image.
to destroy or remove.
relating to organisms whose cells have a nuceleus.
caused by food contaminated with disease-causing germs or toxic substances.
to work or work correctly.
(singular: fungus) organisms that survive by decomposing and absorbing nutrients in organic material such as soil or dead organisms.
taxonomic category of structurally or phylogenetically related species.
network of chemicals and organs that protects the body from disease.
suggestion or hint.
something (such as a bacterium or virus) that causes disease; also referred to as a pathogen.
to provide knowledge.
the act of eating or consuming.
set of organs that form the external covering of the body and protects it from many threats such as infection (in humans, this includes skin).
relationship between two or more forces, objects, or organisms.
grouping based on physical and genetic characteristics following the methods of the Swedish botanist Carl Linnaeus.
measurement of how enlarged an image is
tiny organism, usually a bacterium.
study of the structure, function, and behavior of microscopic organisms.
microorganisms and genetic material present in or on a specific environment.
composed of more than one cell.
cells, organs, and tissues including the brain and spine that respond to internal and external stimuli.
group of tissues that perform a specialized task.
specialized part of a cell that performs a specific function.
living or once-living thing.
organism that causes a disease, such as a virus.
to convince someone to do or believe something through reasoning or argumentation.
process by which plants turn water, sunlight, and carbon dioxide into water, oxygen, and simple sugars.
relating to organisms whose cells have no distinct nucleus.
one-celled organisms in the kingdom protista, such as amoebas. (singular: protozoan)
system where oxygen is taken into the body and an exchange of oxygen and carbon dioxide takes place; in humans consisting especially of the nose and lungs.
distinctive relative size, extent, or degree.
having or consisting of a single cell (also referred to as unicellular).
group of similar organisms that can reproduce with each other.
system of organization.
system that is part of a larger system.
sign or indication of something.
collection of items or organisms that are linked and related, functioning as a whole.
cells that form a specific function in a living organism.
to pass along information or communicate.
having one cell.
animal that transmits a disease from one organism to another.