Cells
Having or consists of a single cell.
Unicellular
The study of living organisms.
Biology
A substance used to stimulate the production of antibodies and provide immunity against one or several diseases.
Vaccine
Having or consisting of many cells.
Multicellular
The process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water.
Photosythesis
The field of biology that studies the composition, structure, and interactions of cellular molecules.
Molecular Biology
What is the smallest structural and functional unit of an organism?
Cells
An individual animal, plant, or single-celled life form.
Organism
What is the process by which organisms combine oxygen with foodstuff molecules?
Cellular Respiration
A phylum or group of phyla that comprises the single-celled microscopic animals.
Protozoa
Any of a number of organized or specialized structures within a living cell.
Organelle