Biology definitions

The taxonomic kingdom of animals that includes organisms that are multicellular, eukaryotic, having cells with membrane-bound nuclei and heterotropic require organic compounds for nourishment. Located on the lower abdomen of birds, this patch develops by the shedding of feathers in this area, and the consequent thickening of the skin, after which it becomes densely populated with blood vessels.

Read more on adaptations in desert animals. Energy The survival of a living organism depends on the continuous input of energy. Evolutionary biology is partly based on paleontologywhich uses the fossil record to answer questions about the mode and Biology definitions of evolution, [57] and partly on the developments in areas such as population genetics.

An invertebrate belonging to Coelenterata phylum characterized by a single interval cavity used for digestion, excretion, and for other survival activities and which has tentacles on the oral end. This is done on both the microscopic and molecular levels, for unicellular organisms such as bacteria Biology definitions, as well as the specialized cells of multicellular organisms such as humans.

A local breeding that interbreeds organisms of the same species or individuals.

Glossary of biology

Adaptations of different sets of characteristics in two similar species, brought about by overlapping territories, resulting in competition. Arboreal refers to animals that have adapted themselves to live and move in the trees.

Glossary of Biological Terms

Modern alternative classification systems generally begin with the three-domain system: Systematics Multiple speciation events create a tree structured system of relationships between species. Biology definitions of these categories, there are obligate intracellular parasites that are "on the edge of life" [64] in terms of metabolic activity, meaning that many scientists do not actually classify such structures as alive, due to their lack of at least one or more of the fundamental functions or characteristics that define life.

It usually occurs in pairs. Monera ; Protista ; Fungi ; Plantae ; Animalia. In a situation where a harmless species has evolved to replicate the warning signal given by a harmful species directed at a common predatorBatesian mimicry occurs. Physiology is the study the interaction of how, for example, the nervousimmuneendocrinerespiratoryand circulatory systems, function and interact.

Molecular biology is a study of the interactions of the various systems within a cell, including the interrelationships of DNA, RNA, and protein synthesis and how those interactions are regulated. It is used more specifically to refer to the upper side of a tortoise or turtle's shell.

Eggs or young offspring of a species produced in single breeding attempt by a female. Darwin theorized that species flourish or die when subjected to the processes of natural selection or selective breeding. The similar structural appearance in organisms, which have different lines of descent.

Widely varied approaches to biology generate information about phylogeny. Developmental biology studies the process by which organisms grow and develop. For a summary of major events in the evolution of life as currently understood by biologists, see evolutionary timeline. Chemical reactions that are responsible for its structure and function are tuned to extract energy from substances that act as its food and transform them to help form new cells and sustain them.

Crocodiles differ from alligators. This value is in comparison to the population of the desired species. The majority of the rest of this biomass and energy are lost as waste molecules and heat.


Although he was opposed to evolution, Buffon is a key figure in the history of evolutionary thought ; his work influenced the evolutionary theories of both Lamarck and Darwin. The organisms responsible for the introduction of energy into an ecosystem are known as producers or autotrophs.

Aristotle's successor at the LyceumTheophrastuswrote a series of books on botany that survived as the most important contribution of antiquity to the plant sciences, even into the Middle Ages. The study of these systems is shared with such medically oriented disciplines as neurology and immunology.

Fertilization takes place outside the female's body. Consequently, evolution is central to all fields of biology. Often found on fish, a barbel is a slim, whisker-like tactile organ located near the mouth.

Glossary of Biological Terms

This type of symmetry is exhibited by most animals, and simply implies that, if a line were drawn down the middle of the body, both sides would be equal and symmetrical. It includes ranks and binomial nomenclature. Cell theory Cell theory states that the cell is the fundamental unit of lifethat all living things are composed of one or more cells, and that all cells arise from pre-existing cells through cell division.Information and definitions of the terms been taken from various reliable government publications and we have done our best to verify their accuracy.

Biology-online is a completely free and open Biology dictionary with over 60, biology terms. It uses the wiki concept, so that anyone can make a contribution. Biology is the study of life and living organisms, from one-celled creatures to the most complex living organism of all — the human being.

Biology includes the study of genes and cells that give living things their special characteristics. Glossary Pearson, as an active contributor to the biology learning community, is pleased to provide free access to the Classic edition of The Biology Place to all educators and their students.

The purpose of the activities is to help you review material you have already studied in class or have read in your text. Biology is the branch of science concerned with the study of life: structure, growth, functioning, and evolution of living things.

This discipline of science comprises three sub-disciplines which are botany (study of plants), Zoology (study of animals), and Microbiology (study of microorganisms). Biology Dictionary Biology is the study of living things. It is broken down into many fields, reflecting the complexity of life from the atoms and molecules of biochemistry to the interactions of millions of organisms in ecology.

Biology definitions
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