Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig and the origin and development of stems.
Also included are the different modified stems that carry out special functions. Multicellular organisms evolved. The first ones were likely in the form of sponges.
Multicellularity led to the evolution of cell specializations that form tissues. Another major event was the evolution of sexual reproduction. The emergence of sex cells in the timeline provided a means for organisms to further diversify. Know more about these crucial events in geologic time in this tutorial There are more species of insects than any other species combined. Biological variation was celebrated in the pantheon of the gods. At one point in this show, a variation of this happened, in succession.
Climate warming can be charted as a long-term rising trend with variation. Marked variation in the amount at successive examinations strongly suggests a neurosis. The variation of the compass in this interval is scarcely affected by the ship's local attraction. The variation in this interval is almost too trifling to be noticed for the purposes of common navigation. Thus it may well come about that our coast lines are swaying up and down in ceaseless variation.
There is never any great variation in the temperature, which is the natural consequence of the place being near the equator. Britannica English: Translation of variation for Arabic Speakers. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Log in Sign Up. Save Word. Definition of variation. Synonyms for variation Synonyms interpretation , riff , take Visit the Thesaurus for More.
Examples of variation in a Sentence the movie begins with a somewhat irreverent variation on the Nativity story the latest in a long line of variations in her hair color.
Recent Examples on the Web During that time, the first variation was made with coarse wool fabric and worn by seafaring Dutchmen. Solomon, sun-sentinel. Genetic variation is what makes us all unique, whether in terms of hair colour, skin colour or even the shape of our faces. DNA or deoxyribonucleic acid is a long molecule that contains our unique genetic code.
Like a recipe book it holds the instructions for making all the proteins in our bodies. Genes are small sections of DNA within the genome that code for proteins. They contain the instructions for our individual characteristics — like eye and hair colour. Inheritance is the process by which genetic information is passed on from parent to child. This is why members of the same family tend to have similar characteristics.
In biology, evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection. A mutation is a change that occurs in our DNA sequence, either due to mistakes when the DNA is copied or as the result of environmental factors such as UV light and cigarette smoke.
If you have any other comments or suggestions, please let us know at comment yourgenome.
0コメント