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  2. Life - Wikipedia

    en.wikipedia.org/wiki/Life

    The definition of life has long been a challenge for scientists and philosophers. [2] [3] [4] This is partially because life is a process, not a substance. [5] [6] [7] This is complicated by a lack of knowledge of the characteristics of living entities, if any, that may have developed outside Earth.

  3. Human physical appearance - Wikipedia

    en.wikipedia.org/wiki/Human_physical_appearance

    Human physical appearance is the outward phenotype or look of human beings. There are functionally infinite variations in human phenotypes, though society reduces the ...

  4. Human body - Wikipedia

    en.wikipedia.org/wiki/Human_body

    Growth and development occur after birth, and include both physical and psychological development, influenced by genetic, hormonal, environmental and other factors. Development and growth continue throughout life, through childhood, adolescence, and through adulthood to old age, and are referred to as the process of aging.

  5. Body shape - Wikipedia

    en.wikipedia.org/wiki/Body_shape

    Human physical appearance – Look, outward phenotype Phenotype – Composite of the organism's observable characteristics or traits; List of human positions – Physical configurations of the human body; Human skeleton – Internal framework of the human body; Sex differences in humans – Difference between males and females

  6. Composition of the human body - Wikipedia

    en.wikipedia.org/wiki/Composition_of_the_human_body

    All 11 are necessary for life. The remaining elements are trace elements, of which more than a dozen are thought on the basis of good evidence to be necessary for life. [1] All of the mass of the trace elements put together (less than 10 grams for a human body) do not add up to the body mass of magnesium, the least common of the 11 non-trace ...

  7. Development of the human body - Wikipedia

    en.wikipedia.org/wiki/Development_of_the_human_body

    Further growth and development continues after birth, and includes both physical and psychological development that is influenced by genetic, hormonal, environmental and other factors. This continues throughout life: through childhood and adolescence into adulthood. [1]

  8. Timeline of human evolution - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_human_evolution

    The universal tetrapod characteristics of front limbs that bend backward at the elbow and hind limbs that bend forward at the knee can plausibly be traced to early tetrapods living in shallow water. [18] Panderichthys is a 90–130 cm (35–50 in) long fish from the Late Devonian period (380 Mya). It has a large tetrapod-like head.

  9. Living systems - Wikipedia

    en.wikipedia.org/wiki/Living_systems

    Below the level of living systems, he defines space and time, matter and energy, information and entropy, levels of organization, and physical and conceptual factors, and above living systems ecological, planetary and solar systems, galaxies, etc. [3] [4] [5] Miller's central thesis is that the multiple levels of living systems (cells, organs ...