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  2. Animal - Wikipedia

    en.wikipedia.org/wiki/Animal

    Most animals rely on biomass and bioenergy produced by plants and phytoplanktons (collectively called producers) through photosynthesis. Herbivores, as primary consumers , eat the plant material directly to digest and absorb the nutrients, while carnivores and other animals on higher trophic levels indirectly acquire the nutrients by eating the ...

  3. Biology - Wikipedia

    en.wikipedia.org/wiki/Biology

    Photosynthesis changes sunlight into chemical energy, splits water to liberate O 2, and fixes CO 2 into sugar. Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organism's metabolic activities via cellular respiration. This chemical energy is stored ...

  4. Human - Wikipedia

    en.wikipedia.org/wiki/Human

    Humans also have a more barrel-shaped chests in contrast to the funnel shape of other apes, an adaptation for bipedal respiration. [153] Apart from bipedalism and brain size, humans differ from chimpanzees mostly in smelling, hearing and digesting proteins. [154]

  5. Anatomy - Wikipedia

    en.wikipedia.org/wiki/Anatomy

    The teeth are conical and mostly uniform in size. The surface cells of the epidermis are modified into horny scales which create a waterproof layer. Reptiles are unable to use their skin for respiration as do amphibians and have a more efficient respiratory system drawing air into their lungs by expanding their chest walls. The heart resembles ...

  6. Apple - Wikipedia

    en.wikipedia.org/wiki/Apple

    An apple is a round, edible fruit produced by an apple tree (Malus spp., among them the domestic or orchard apple; Malus domestica).Apple trees are cultivated worldwide and are the most widely grown species in the genus Malus.

  7. Ocean - Wikipedia

    en.wikipedia.org/wiki/Ocean

    Ocean photosynthesis also produces half of the oxygen in the Earth's atmosphere. [13] Light can only penetrate a few hundred more meters; the rest of the deeper ocean is cold and dark (these zones are called mesopelagic and aphotic zones). The continental shelf is where the ocean meets dry land. It is more shallow, with a depth of a few hundred ...

  8. Copper - Wikipedia

    en.wikipedia.org/wiki/Copper

    Copper is essential in the aerobic respiration of all eukaryotes. In mitochondria, it is found in cytochrome c oxidase, which is the last protein in oxidative phosphorylation. Cytochrome c oxidase is the protein that binds the O 2 between a copper and an iron; the protein transfers 4 electrons to the O 2 molecule to reduce it to two molecules ...