CIENCIAS DE LA NATURALEZA 1º DE E.S.O. PRIMER TRIMESTRE FIRST TERM Chapter 3: Life on Earth

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CIENCIAS DE LA NATURALEZA 1º DE E.S.O. PRIMER TRIMESTRE FIRST TERM Chapter 3: Life on Earth

LIVING THINGS have changed since the origin of life. They have evolved. 3.3.ORGANIZATION OF LIVING ORGANISMS

Origin of life (3.6–3.8 billion years ago) evolution/brief-history-life.html Launch the interactive in this web site and answer: The history of LIVING THINGS Place in this 24 hours timeline the moment in which the following species appeared Snails First land plants Sharks First insects First reptiles First conifers First turtles Lizards Mammals Frogs Birds 1 second = years 1 minute = years 1 hour = years Heyday of dinosaurs First hominids Origin of life (3.6–3.8 billion years ago) 3.3.ORGANIZATION OF LIVING ORGANISMS

Biodiversity in this amount of living things is really huge ORGANIZATION OF LIVING ORGANISMS

Living things can be classified as unicellular organisms or multicellular organisms Caenorhabditis elegans (blue) eating its main food source Escherichia coli (red) depicting serpins from diverse biological systems from unicellular to multicellular organisms. A Colony of Escherichia Coli Bacteria 3.3.ORGANIZATION OF LIVING ORGANISMS

Unicellular organisms A unicellular organism is formed by one single cell, which perfoms all the vital functions. They may be prokaryotic or eukaryotic Paramecium caudatum (eukaryotic cell) Ameoba proteus (eukaryotic cell) Bacteria Escherichia coli (prokaryotic cell) Bacteria Salmonella typhimurium (prokaryotic cell) 3.3.ORGANIZATION OF LIVING ORGANISMS

Unicellular organisms A unicellular organism is formed by one single cell, which perfoms all the vital functions. They may be prokaryotic or eukaryotic Nutrition v=V1644oLsfas&feature=related Interaction GZP0ijukt8&feature=related aZE5FQ284&feature=related watch?v=DY9DNWcqxI4 &feature=related Reproduction 3.3.ORGANIZATION OF LIVING ORGANISMS

Multicellular organisms A multicellular organism is formed by thousands of cells, and perfoms all the vital functions. They are organized according to increasing levels of complexity. Multicellular organisms may be prokaryotic or eukaryotic 3.3.ORGANIZATION OF LIVING ORGANISMS

LIVING THINGS evolve. Unicellular organisms Multicellular organisms Prokaryotic cells Eukaryotic cells Autotrophs Heterotrophs 3.3.ORGANIZATION OF LIVING ORGANISMS