Chapter Summary: The Origin Of Life

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Chapter one contemplates the origin of life and evaluates the damages caused by humans. Life on earth is estimated to have began approximately 4,600 million years ago and oxygen having accumulated the earth’s atmosphere much later around 2,400 million years ago. The existence of oxygen led to the growth of small cellular organisms like fungi that spread throughout the world 500 million years ago. Therefore, if life came into existence based on what already exists it is possible to create artificial life that can change what has already been destroyed by humans. This chapter goes on to describe four stages in which a cell evolved. The evolution of the cell is what led to existence of things in the present. The initial stage of the cell was abiotic synthesis of organic monomers. This stage was followed by creation of polymers, then formation of pre-cells that led to self-replication of molecules in combinative chain. …show more content…
Athropods are animals with segmented bodied and jointed legs for instance Millipedes and Centipedes. Nematoda are class of worms that are unsegmented a good example is Roundworms. Mollusca are found in both land and water and have soft unsegmented bodies, while some molluscas have shells examples include Snails, Octopuses and Squids. At this point I will notes that there countries such as France where Snails also called Escargot are delicacies. Annelida are elongated cylindrical worms such as Leeches and Earthworms. Platyhelminthes are animals with a flattened body with bilateral symmetry and examples include Tapeworms and Planaria. Ctenophora live in the marine and have biradial symmetry; they also move by use of cilia and a good example is Comb Jelly. Cnidaria are marina animals that look like sacks and that are known to sting examples include Jellyfish, Sea Anemones, and Hydras. Lastly, Porifera are animals consisting of sponges that live in water examples are Leuconia and Glassrope

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