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  2. Human uses of living things - Wikipedia

    en.wikipedia.org/wiki/Human_uses_of_living_things

    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 ...

  3. Biological roles of the elements - Wikipedia

    en.wikipedia.org/wiki/Biological_roles_of_the...

    A large fraction of the chemical elements that occur naturally on the Earth's surface are essential to the structure and metabolism of living things. Four of these elements (hydrogen, carbon, nitrogen, and oxygen) are essential to every living thing and collectively make up 99% of the mass of protoplasm. [1]

  4. Nutrition - Wikipedia

    en.wikipedia.org/wiki/Nutrition

    The first recommended dietary allowances for humans were developed to address fears of disease caused by food deficiencies during the Great Depression and the Second World War. [3] Due to its importance in human health, the study of nutrition has heavily emphasized human nutrition and agriculture, while ecology is a secondary concern.

  5. Human uses of plants - Wikipedia

    en.wikipedia.org/wiki/Human_uses_of_plants

    Humans depend on plants for food, either directly or as feed for domestic animals. Agriculture deals with the production of food crops, and has played a key role in the history of world civilizations. Agriculture includes agronomy for arable crops, horticulture for vegetables and fruit, and forestry for timber. [3]

  6. Human food - Wikipedia

    en.wikipedia.org/wiki/Human_food

    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. Display of various foods. Humans eat various substances for energy, enjoyment and nutritional support. These are usually of plant, animal, or fungal origin, and contain ...

  7. 20 useful and innovative gadgets to make life easier for ...

    www.aol.com/lifestyle/products-to-make-life...

    It's especially useful for those seniors who are still living on their own and still maintain their back yard, but who need a little extra help to make some of the more back-breaking work easier.

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