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A variety of living things serve as models in biological research, such as in genetics, and in drug testing. Until the 19th century, plants yielded most of the medicinal drugs in common use, as described in the 1st century by Dioscorides. Plants are the source of many psychoactive drugs, some such as coca known to have been used for thousands ...
[citation needed] Fire was used to clear out caves before living in them, helping to begin the use of shelter. [38] The many uses of fire may have led to specialized social roles, such as the separation of cooking from hunting. [39] The control of fire enabled important changes in human behavior, health, energy expenditure, and geographic ...
The arthropods are a phylum of animals with jointed legs; they include the insects, arachnids such as spiders, myriapods, and crustaceans. [1] Insects play many roles in culture including their direct use as food, [2] in medicine, [3] for dyestuffs, [4] and in science, where the common fruit fly Drosophila melanogaster serves as a model organism for work in genetics and developmental biology.
Hunter-gatherers have used non-human animal sinews as lashings and bindings. Leather from cattle, pigs and other species is widely used to make shoes, handbags, belts and many other items. Other animals have been hunted and farmed for their fur, to make items such as coats and hats, again ranging from simply warm and practical to the most ...
Biological organization spans several scales and are determined based different structures depending on what the system is. [1] Examples of biological systems at the macro scale are populations of organisms. On the organ and tissue scale in mammals and other animals, examples include the circulatory system, the respiratory system, and the ...
A wheeled buffalo figurine—probably a children's toy—from Magna Graecia in archaic Greece [1]. Several organisms are capable of rolling locomotion. However, true wheels and propellers—despite their utility in human vehicles—do not play a significant role in the movement of living things (with the exception of the corkscrew-like flagella of many prokaryotes).
All living things contain two types of large molecule, proteins and nucleic acids, the latter usually both DNA and RNA: these carry the information needed by each species, including the instructions to make each type of protein. The proteins, in turn, serve as the machinery which carries out the many chemical processes of life.
Human food is food which is fit for human consumption, and which humans willingly eat. Food is a basic necessity of life, and humans typically seek food out as an instinctual response to hunger ; however, not all things that are edible constitute as human food.
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