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The Hierarchy of Life by Rachel Buck

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The Hierarchy of Life by Rachel Buck
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Assignment 14 Open Pedagogy

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  • THE HIERARCHY OF LIFE
  • By Rachel Buck
  • Hey there! Today we are going to examine all 12 levels within the hierarchy of life.
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  • https://bio156.org/assignment14
  • The first 3 levels are known as sub-cellular because they are not living.
  • SIMPLE
  • Living things are highly organized on a scale from simple organisms, to complex ones.
  • COMPLEX
  • Atoms are the first level on the hierarchy!Atoms are the smallest units of matterThey consist of a nucleus surrounded by electrons Atoms are composed of protons, neutrons and electronsAn example would be hydrogen or oxygen
  • Next up are moleculesMolecules are chemical structures consisting of at least two atoms held together by a chemical bondThese atoms are bonded together through ionic bonds, covalent bonds or hydrogen bondsWater, or H2O, is an example of a molecule
  • The third level of the hierarchy consists of organellesOrganelles are accumulations of molecules surrounded by membranesThey exist within cells and are designed to perform specific functionsSome examples of organelles include mitochondria, nuclei and rough endoplasmic reticulum
  • YAY! We made it to our first living unit of life, cellsAll living things are composed of cellsComplex organisms, or eukaryotes, are composed of many cells that work together to perform different functionsProkaryotes are single-celled organisms that lack organelles
  • Tissues are the next level on the scale:Tissues are groups of similar cells carrying out the same functionThere are four main tissue categories: epithelial, connective, muscular and nervousEpithelial tissue, as pictured in our X-ray, can be found all over the body including the dermis of the skin
  • The 6th and 7th levels in the hierarchy are organs and organ systemsOrgans are collections of tissues grouped together by basic functionAn example of an organ would be the kidneysOrgan systems are teams of organs that work together to maintain homeostasis in living thingsThe kidneys are apart of the urinary system
  • All of these come together to create organismsOrganisms are individual living entities There are tons of examples of this, such as dogs, cats, birds, fish, insects, E. coli, reptiles, and even, YOU AND ME!
  • Populations are next! Populations refer to all the individuals of a species relevant to a specific areaFor example, all the human beings in Waco, Texas, all the sperm whales in the southern pacific ocean, or all the cats in Venezuela
  • We are almost done! Populations of different species in one area, such as the plants and animals in a forest, come together to create a community
  • Next up we have an ecosystem, which includes all living and non-living things existing together in an areaIncludes animals, plants, water, rocks, bacteria, microorganisms, heat, etc.
  • LAST but certainly not least in the hierarchy of life is the......BIOSPHERE!This includes every atom, molecule, organelle, cell, tissues, organ, organ system, organism, population, community, and ecosystem that make up our home: EARTH
  • In conclusion, life is a truly fascinating and multifaceted concept. Each and every layer of the hierarchy contains its own unique characteristics. We are so fortunate to be able to study all levels with modern day technology, CHEERS to the future!
  • THE END!
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