theory definition biology

The Earth's ecosphere was rapidly changing and throwing up a wide range of ecological niches that new adaptive organisms, such as mammals, could fit into. Basically, if evidence accumulates to support a hypothesis, then the hypothesis can become accepted as a good explanation of a phenomenon. Higher organisms are also capable of asexual reproduction. Word origin: L theōria < Gk theōría a viewing, contemplating. In circumstances not amenable to experimental testing, theories are evaluated through principles of abductive reasoning. These processes also allow for molecule transportation between cells. Build a city of skyscrapers—one synonym at a time. See the full definition for theory in the English Language Learners Dictionary, Thesaurus: All synonyms and antonyms for theory, Nglish: Translation of theory for Spanish Speakers, Britannica English: Translation of theory for Arabic Speakers.

Can you spell these 10 commonly misspelled words? DNA transcription and RNA translation make the process of protein synthesis possible. This new zygote becomes another plant. Cell Theory. Any information here should not be considered absolutely correct, complete, and up-to-date. Prokaryotic cells include bacteria and archaeans. With modern microscopes, the processes behind cell theory can easily be viewed and studied.

This theory revolves around the fact that no matter what type of organism we view under a microscope, the organisms are clearly divided into a number of different cells. Biology - Biology - The theory of evolution: As knowledge of plant and animal forms accumulated during the 16th, 17th, and 18th centuries, a few biologists began to speculate about the ancestry of those organisms, though the prevailing view was that promulgated by Linnaeus—namely, the immutability of the species.

For more, see our article on the Three Parts of Cell Theory. Scientific theory definition, a coherent group of propositions formulated to explain a group of facts or phenomena in the natural world and repeatedly confirmed through experiment or observation: the scientific theory of evolution. Below is a picture of two Euglena organisms, seen just after reproduction. He assumed the structures were limited to the tissues of plants. Even with a microscope, it is not always possible to see the exact functioning of a cell. Each will try to survive, grow, and eventually reproduce again. Animal organisms can reproduce asexually through processes such as budding, fragmentation, regeneration, and parthenogenesis.

.. Since this casual use does away with the distinctions upheld by the scientific community, hypothesis and theory are prone to being wrongly interpreted even when they are encountered in scientific contexts—or at least, contexts that allude to scientific study without making the critical distinction that scientists employ when weighing hypotheses and theories. Microscopes allowed early scientists to view and postulate about the cells they could see. Somatic cells replicate through mitosis and sex cells reproduce via meiosis. What does the "S" in Harry S. Truman stand for? Build a city of skyscrapers—one synonym at a time. Two related, yet distinct, meanings of theory Synonym Discussion of theory. Evolution is the backbone of biology and the theory that explains much about evolution is the bedrock on which all biology is built, regardless of the apparent absence in some disciplines of biology. A theory is valid as long as there is no evidence to dispute it. The DNA in the parent organism is duplicated, as are the internal organelles. The content on this website is for information only. These cells can then differentiate when given different signals to produce different types of tissues and organs.

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