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Human Biology and Evolution Humans are Alive The earliest human life form can be traced back more than 35 billion years ago Humans are said to be descendants of a single celled ancestor Although they are different in size and shape all basic functions are alike The more complex the organization of the cell became the more successful and developed it became As these single celled organisms developed they became known as pre-humans We share many characteristics with these pre-humans Some of these characteristics include the masters of heredity DNA and RNA as well as proteins composed of amino acids membranes or bound cells and lastly controlled cell division or mitosis key to the daughter cells Kingdoms are Alive The diversity of kingdoms is arranged into kingdoms that classify organisms from simple to complex The traditional five kingdoms are Prokaryote Protoctista Fungi Plantae and Anamalia Prokaryote is a bacterium that lacks nuclear membrane Protoctista is a heterogeneous grouping that combines a great diversity of forms Fungi are known for being important agents of composition they include yeast and mushroom Plantae are categorized as plants that use sunlight to convert to energy Lastly Anamalia Anamalial members are multicellular and fully mobile they obtain their nutrients from other living things Our Place in Nature Humans are hierarchically classified into a series of increasingly specific groups They range from the Kingdom Animalia to the Genus Homo the Homo Sapiens appears to be its only living representative Kingdom Animalia Phylum Chordata Subphylum Vertabrata Class Mammalia Family Hominidfae Genus Homo Our Place in time Over a considerably large span of geological time life on earth has changed drastically Humans and their close relatives are the most recent arrivals in the Tertiary period The periods range Precambrian which was over 56 million years ago to Quaternary which was 18 million years ago to present In this chart you will be able to see all periods ranging from Precambrian to
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